Question

13. A candidate is required to answer 7 questions out of 12 questions which are divided into
two groups, each containing 6 questions. He is not permitted to attempt more than 5
questions from either group. In how many ways can he choose the 7 questions?​

Answer 1

Answer:

A candidate can attempt 5 questions from group Iand 2 from group II or 4 from group I and 3 from group II or 3 from group I and 4 from group II or 2from group I and 5 from group II.

This can be done in

6C5×6C2+6C4×6C3+6C3×6C4+6C2×6C5=6×15+15×20+20×15+15×6=90+300+300+90=780

Step-by-step explanation:

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