Tutors Answer Your Questions about Permutations (FREE)
Question 1024511: As shown above, a classic deck of cards is made up of 52 cards, 26 are black, 26 are red. Each color is split into two suits of 13 cards each (clubs and spades are black and hearts and diamonds are red). Each suit is split into 13 individual cards (Ace, 2-10, Jack, Queen, and King).
If you select a card at random, what is the probability of getting:
1) A(n) 2 of Hearts?
2) Spades or Hearts?
3) A number smaller than 4 (counting the ace as a 1)?
Click here to see answer by mathmate(429)  |
Question 1024512: In a family with 3 children what is the probability of having 1 boy and then 2 girls, in that order? (Exclude multiple births and assume all outcomes are equally likely).
In a family with 3 children, what is the probability of having 1 boy and 2 girls, in any order? (Exclude multiple births and assume all outcomes are equally likely).
Click here to see answer by FrankM(1040)  |
Question 1024465: Determine how many numbers between 10 and 1000 inclusive
contain a repeated digit and the rest of the digits(if any)
are distinct.(eg:101,229).
My solution :
For two digits number : [P(9,1)*P(9,1)-1]+[[P(9,1)*P(9,1)]/9]=89.
For three digits number : [9*9*8]+[9*9]+[9*9]+[9*9]=891.
891 + 89 = 980 numbers.
Is this the correct answer?
Thanks in advance
Click here to see answer by Edwin McCravy(20054)  |
Question 1024507: A school dance committee is to consist of 2 freshmen, 3 sophomores, 4 juniors, and 5 seniors. If 6 freshmen, 7 sophomores, 7 juniors, and 8 seniors are eligible to be on the committee, in how many ways can the committee be chosen?
Click here to see answer by Theo(13342)  |
Question 1024915: I have four numbers: 2, 92, 79, and 71. Without using any number twice, and always using the four numbers, I need to come up with a list of every possible combination. I know that is going to add up to a very large amount of combinations, but so far, every other place I checked failed miserably. I guess it's up to you to save the day now. Good luck, and thank you!
Click here to see answer by mathmate(429)  |
Question 1025521: Please help me this problem is driving me crazy. I need to know what equation do I use.
A computer password is required to be 5 characters long. How many passwords are possible if the password requires 3 letter(s) and 2 digits (numbers 0-9), where no repetition of any letter or digit is allowed?
There are possible passwords
Click here to see answer by Edwin McCravy(20054)  |
Question 1025678: Please help me I never did a problem like this. Show all steps
A computer password is required to be 7 characters long. How many passwords are possible if the password requires 1 letter(s) and 6 digits (numbers 0-9), where no repetition of any letter or digit is allowed?
There are possible passwords
Click here to see answer by stanbon(75887) |
Question 1025726: Please is there anyone that can help me with this problem. I have look at videos and read my book on this but still can not figure this out. I thought maybe by there being 26 letters in the alphabet and 10 numbers I could find it that way. Then I tried by it 7 characters long but that was still wrong.
A computer password is required to be 7 characters long. How many passwords are possible if the password requires 1 letter(s) and 6 digits (numbers 0-9), where no repetition of any letter or digit is allowed?
There are possible passwords.
Click here to see answer by Theo(13342)  |
Question 1025726: Please is there anyone that can help me with this problem. I have look at videos and read my book on this but still can not figure this out. I thought maybe by there being 26 letters in the alphabet and 10 numbers I could find it that way. Then I tried by it 7 characters long but that was still wrong.
A computer password is required to be 7 characters long. How many passwords are possible if the password requires 1 letter(s) and 6 digits (numbers 0-9), where no repetition of any letter or digit is allowed?
There are possible passwords.
Click here to see answer by josmiceli(19441)  |
Question 1025898: In a box there are R red pens and B blue pens. Pens are randomly selected, one at a time, until a red one is obtained. Assume that each selected pen is replaced before the next one is drawn. (a) what is the probability that you need to pick up a pen 3 times? (b) what is the probability that you need to pick up a pen at least 4 times?
Click here to see answer by Fombitz(32388)  |
Question 1026107: A fan of country music plans to make a custom CD with 1313 of her 2929 favorite songs. How many different combinations of 1313 songs are possible? Is it practical to make a different CD for each possible combination? How many different combinations of 13 songs are available?
Click here to see answer by Alan3354(69443)  |
Question 1026955: A six digit number is to be formed using only digits from the set {1,2,3,5,6,7,9}. There are to be three distinct digits in the numbers formed, one of which appears four times and the other two, once each. How many different numbers are possible.
Click here to see answer by richard1234(7193)  |
Question 1027443: In the set of three-digit integers {100,101,..., 999}, how many integers are there
a) with three distinct digits that are either increasing ( as in 257, 139) or decreasing (as in 752, 430)?
b) with three digits that are either non-decreasing ( as in 477, 555, 123) or non-increasing (666, 321, 943)? (Note that digits may repeat.)
All steps and explanations are greatly appreciated..Thanks!
Click here to see answer by Edwin McCravy(20054)  |
Question 1027444: All steps and explanations are appreciated! Thank you!!
In the set of three-digit integers {100,101,...,999} how many integers are there
a) with three distinct digits that are either increasing (as in 257, 139) or decreasing (as in 752, 430)
b) with three digits that are either non-decreasing (as in 477, 555, 123) or non-increasing (666,321,943)? (Note that digits may repeat.)
Click here to see answer by Edwin McCravy(20054)  |
|
Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035
|