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Permutation and combination

by kschong
Tags: combination, permutation
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kschong
#1
Jan9-10, 09:33 PM
P: 5
For this question, i already solve the part a and part b. For the part c, i try to solve it but i cant get the answer that given. Can someone explain to me? How to do the part c. Thanks!
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tiny-tim
#2
Jan10-10, 04:08 AM
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P: 26,148
Hi kschong!

So there's 24 tanks, of which 6 are high viscosity, add 4 are high impurity: what is the probability that 4 tanks chosen at random include exactly one of each?

Show us your full calculations, and then we can see what went wrong, and we'll know how to help.


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