Tutors Answer Your Questions about Permutations (FREE)
Question 892187: please help me solve this problem.
a computer password made up of four characters. Each can be a capital letter (A-Z)a lower case letter (a-z) or a digit (0-9). if the password is randomly chosen, what is the probability that the password will only contain lower case letters? hint: use the multiplication rule to count the sample space and event space.
thank you =)
Click here to see answer by Fombitz(32388)   |
Question 892316: Given a set of N numbers, find the number of distinct possible sums that can be obtained by taking any number of elements from the N number of numbers and adding them.
this is a generalised question need to derive a general formula
Click here to see answer by Edwin McCravy(20054)  |
Question 891919: How many combinations of 3 numbers are there in 23 numbers, when the order of each group doesn't matter?
EX: Group A would be 1,2,3 OR 2,3,1 OR 3,2,1 OR 1,3,2, etc... These would all be considered the same group.
Click here to see answer by Edwin McCravy(20054) |
Question 892184: Please help me solve this equation
1.Give your answer the following three questions in symbolic form, using the notation.
a. the board of directors of a company has 14 members. in how many ways can it choose a committee of three members? (where all members have equal standing)
b. 22 drivers start a race. assuming all of the drivers are equally skilled. how many top five finishes are possible?
c. how many different 3 topping pizzas can be made from a list of 20 different toppings?
Thank you =)
Click here to see answer by Edwin McCravy(20054) |
Question 892592: Please help..Decide whether you would use a permutation, a combination, or neither. Next, write the solution using permutation notation or combination notation, if possible, and, finally, answer the question.
A club with 30 members is to select five officers (president, vice president, secretary, treasurer, and historian). In how many ways can this be done?
Click here to see answer by Edwin McCravy(20054) |
Question 892395: Classify the problem as a permutations, a combinations, or neither.
A student is asked to answer 11 out of 13 questions on a exam. In how many ways can she select the questions to be answered?(Order is not important).
(b) In how many ways can a chairperson and a vice chairperson be selected from a committee of 15 senators?
(c)How many permutations are there of the following word?
Combinatorics
(d) Tarot cards are used for telling fortunes, and in a reading, the arrangement of the cards is as important as the cards themselves. How many different readings are possible if four cards are selected from a set of eight Tarot cards?
(E)A state's license plate consist of four letters followed by three numerals, and 246 letter arrangements are not allowed. How many plates can the state issue?
Click here to see answer by Edwin McCravy(20054) |
Question 892630: If a committee of 3 is to be chosen at random from a class of 13 students, what is the probability of the committee is to consist of a president, a vice president, and a treasurer?
I tried 1/286 and that was wrong.
Click here to see answer by stanbon(75887) |
Question 892694: Is this a trick question or does the 6 seats in the first row alter the answer?
In how many ways can 5 students from a class of 16 be arranged in the first row of seats. (There are 6 seats in the first row).
Help please.
Click here to see answer by Theo(13342)  |
Question 892939: A shop has 8 different types of post cards and at least 12 of each type. How many selections of 12 postcards are there if
a) you can choose any number of each type?
b) you can choose at most one of type 1 and any number of the other types?
Click here to see answer by Edwin McCravy(20054) |
Question 892937: An exam paper in mathematics contains 12 questions and students must answer 10 of them.
a) in how many ways can a student choose 10 out of the 12 questions to answer?
b) show, by using the extended pigeonhole principle, that if 200 students write the exam paper, then at least 4 students will choose the same 10 questions to answer. state clearly what the pigeons and pigeonholes are.
Click here to see answer by richard1234(7193)  |
Question 893814: A club has 49 members.
a) How many ways are there to choose four members of the club to serve on an executive committee?
[Num] ways
b) How many ways are there to choose a president, vice president, secretary, and treasurer of the club, where no person can hold more than one office?
[Num] ways
Click here to see answer by algebriac(10) |
Question 645715: Question from GRE PowerPrep II Practice Test #2
Quant section 3 of 5
Question 13 or 20
A certain identification code is a list of five symbols: S1,S2,D1,D2,D3. Each of the first 2 symbols must be one of the 26 letters of the English alphabet, and each of the last 3 symbols must be one of the 10 digits. Repeated letters and digits are not allowed.) What is the total number of different identification codes?
Click here to see answer by somina(1) |
Question 894605: How many different digit numbers can be formed using the integers 1,2,3,4?
There are 8 letter boxes in a post office, In how many ways can a man post 4 distinct letters?
How many numbers of six digits can be formed from the digits 0,1,3,5,7,& 9 when no digit is repeated?
In how many ways can four boys & three girls be seated in a row containing seven seats if all three girls are together?
Click here to see answer by mark_henrhiz(40)  |
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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
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