Combinatorics - Inviting Friends
CAT 1996 Slot 1 · Quantitative Ability · Easy · QA
This is an easy Quantitative Ability question from the CAT 1996 Slot 1 paper. It tests QA. The full answer key and a step-by-step explanation are below — try it yourself first, then reveal the solution.
A man has 9 friends: 4 boys and 5 girls. In how many ways can he invite them, if there have to be exactly 3 girls in the invitees?
- A.
320
- B.
160
- C.
80
- D.
200
Answer
B
Explanation
Ways to choose 3 girls out of 5 . Each of the 4 boys can either be invited or not . Total ways .
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