Question

In how many ways can three committee members be chosen from a pool of 15 candidates?

Answer 1

15C3

the number of combinations of 3 in 15

do you know the formula for this?

Answer 2

no

Answer 3

nCr = n!
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r! (n-r)!

Answer 4

ok so what do i do next

Answer 5

plug in n = 15 and r = 3

Answer 6

455

Answer 7

do you know what 15! ( 15 factorial) is?

Answer 8

@rolldextro No direct answers please!

Answer 9

no i dont

Answer 10

I am typing the solution..

Answer 11

15! = 15*14*13.... * 1

Answer 12

A quick way of doing this is to just go down 3 steps from 15 - that is 15*14*13

then divide by 3! which is 3*2*1


so we have 15C3 = 15*14*13
--------
3*2*1

work that out and you have the answer.