Question

In how many ways can a student work 7 out of 10 questions on an exam?

Answer 1

i am going to guess that there was more to the problem
for example, the test is true/false

Answer 2

unless it is just this: a student must work out 7 out of 10 questions on an exam. how many ways can she select the 7 questions?

Answer 3

Yes...that's all the questions asked.

Answer 4

you copied it exactly?

Answer 5

Yes

Answer 6

maybe written by someone for whom english is a third language

Answer 7

8) In how many ways can a student work 7 out of 10 questions on an exam? 8)
A) 10,000,000 ways B) 720 ways
C) 21 ways D) 120 ways

Answer 8

i am going to guess that you are being asked to compute
\[\dbinom{10}{7}\] which you might also see as \(_{10}C_7\)

Answer 9

ah ok yes, that is what you want
\[_{10}C_7=\frac{10\times 9\times 8}{3\times 2}=10\times 3\times 4=120\]

Answer 10

Thank you

Answer 11

yw