Tutors Answer Your Questions about Permutations (FREE)
Question 734262: how can i solve this?
at a party 16 people meet together. Each pair of these individuals decide to chance whether you hailed by handshake or not (likelihood handshake = 0.40). On average, how many handshakes occur?
Click here to see answer by lynnlo(4176)  |
Question 734265: any solution for this?
We have 15 total androgens in a village. From this population a year die just 8 people. (The 8 people who die are randomly selected and all groups of 8 persons are equally likely.)
On average how androgens survive (both);
Click here to see answer by lynnlo(4176) |
Question 734270: We have 15 total androgens in a village. From this population a year die just 8 people. (The 8 people who die are randomly selected and all groups of 8 persons are equally likely.)
On average how androgens survive (both);
any ideas how to solve? any soloution?
Click here to see answer by lynnlo(4176) |
Question 734066: Respected Sir,
my Question is: Find the number of ways in which one can post 5 letters in 7 letter boxes.I know that we can solve this by doing 7X7X7X7X7=7^5
But my question is that ,why can't we do 5X5X5X5X5X5X5=5^7? Why ,this way of doing is wrong? how will you provide a valid explanation/reason for this?
Thank you in anticipation .
Click here to see answer by KMST(5328)  |
Question 735183: The members of a club are 12 boys and 8 girls .In how many ways can a committee of 3 boys and 2 girls be formed?
Please sir can you help me that is it a permutation? Or combination?and how???
Q2.... how many (a) diagonals and (b) triangles can be formed by joining the vertices of the polygon having
(1) five sides....(2) 8 sides.......(3) 12 sides...
please help me how can i teach somebody that its a combination or permutations??? how can?
many thanks
Click here to see answer by lynnlo(4176) |
Question 735297: From a second grade class of 11 boys and 8 girls, 5 students are to be selected for flag duty. Find the number of ways this can be done if
a)There can be at most 3 boys
b)There must be at least 2 boys and at least 2 girls
Click here to see answer by lynnlo(4176) |
Question 735802: Here is the problem: A soccer team has 16 players. How many ways can the coach choose a starting team of 11 players?
I have been working on this problem for forever and still am having trouble solving it. Here's what I came up with but I know I'm doing something wrong.
16!/11!(16-11)! then i write it all out:
________________ <--this is the fraction divider sign thing haha
11! (16-11)!
16x15x14x13x12x11x10x9x8x7x6x5x4x3x2x1
_______________________________________
11x10x9x8x7x6x5x4x3x2x1x(5x4x3x2x1)
it gives me some bizarre number. If you could show how to do the work correctly to get an answer that actually makes sense and explain where I went wrong that would be great. Thanks.
Click here to see answer by rothauserc(4718)  |
Question 735802: Here is the problem: A soccer team has 16 players. How many ways can the coach choose a starting team of 11 players?
I have been working on this problem for forever and still am having trouble solving it. Here's what I came up with but I know I'm doing something wrong.
16!/11!(16-11)! then i write it all out:
________________ <--this is the fraction divider sign thing haha
11! (16-11)!
16x15x14x13x12x11x10x9x8x7x6x5x4x3x2x1
_______________________________________
11x10x9x8x7x6x5x4x3x2x1x(5x4x3x2x1)
it gives me some bizarre number. If you could show how to do the work correctly to get an answer that actually makes sense and explain where I went wrong that would be great. Thanks.
Click here to see answer by Edwin McCravy(20054)  |
Question 736921: If I offer advertisers the choice of using one of 3 colors in their listing, how many possible combinations of color choices are there for the colors on 2 sides of a sheet?
Been out of school a long time but I know there would be potentially 27 color combination on one side (each side will have multiple listings) but when I expand that to consider both side, does that mean I have 27 squared possibilities?
Click here to see answer by rothauserc(4718) |
Question 737297: Ralph has seven different colors of leftover paint. Since there is not enough of any one color to paint all four walls of his room, he has decided to paint each wall a different color. How many different ways can he carry out his plan?
What I have so far -
The first wall can be any one of 7 colors.
The second wall can be any of the 6 remaining colors
The third can be any of 5 colors
There are 4 colors remaining to paint the last wall.
So there are 7 × 6 × 5 × 4 = 840 ways. But in permutation?
Click here to see answer by stanbon(75887) |
Question 739481: Please help me solve this problem.
How many ways are there to pair off eight women at the dance with eight of these 12 men?
This is what I have so far, but I think I have it wrong. Thank you in advance.
=n∁r
=12C8
= 12!
4! 8!
= 12*11*10*9
4*3*2*1
=495 combinations
Click here to see answer by Ed McCravy(3) |
Question 740494: Pour an ordinary dice 129 times and let X the sum of all indications that it brings. what is the expected value E(X) of the random variable X? and what is the variance Var(X) of the random variable X?
any help here?
Click here to see answer by lynnlo(4176) |
Question 742113: HI tutors, Can you help me answer this please?
22 people decide to play cricket. In how many ways can 2 teams of eleven players be formed? I get 352,716 using C(m,n)= m!/n!m!.Am I close?
Thank you.
Click here to see answer by KMST(5328) |
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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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