SOLUTION: How many ways can a student work 7 out of 10 questions on an exam? (A) 720 (B) 10,000,000 (C) 21 (D) 120 Can you please help me with work shown? Thanks!

Algebra ->  Probability-and-statistics -> SOLUTION: How many ways can a student work 7 out of 10 questions on an exam? (A) 720 (B) 10,000,000 (C) 21 (D) 120 Can you please help me with work shown? Thanks!       Log On


   

Question 553348: How many ways can a student work 7 out of 10 questions on an exam?
(A) 720
(B) 10,000,000
(C) 21
(D) 120
Can you please help me with work shown?
Thanks!
Answer by prateekagrawal(56) About Me  (Show Source):
You can put this solution on YOUR website!
we need to choose 7 questions out of 10 here...
so,+10C7+=+10%21+%2F+%287%21%2A3%21%29+=+10%2A9%2A8%2F3%2A2%2A1+=+10%2A3%2A4+=+120 ways