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A candidate is required to answer 6 out of 12 questions which are divided into two parts A and B, each containing 6 questions and he/she is not permitted to attempt more that 4 questions from any part. In how many different ways can he/she make up his/her choice of 6 questions?

A

850

B

800

C

750

D

700

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    A
    `.^15C_5`
    B
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