A student has to answer 10 out of 13 que...

A student has to answer 10 out of 13 questions in an examination. The number of ways in which he can answer if he must answer atleast 3 of the first five questions is `276` b. `267` c. `80` d. `1200`

276

`""^(13)C_(10)-""^(5)C_(3)`

`""^(5)C_(3).""^(8)C_(7)+""^(5)C_(4).""^(8)C_(6)+""^(5)C_(5).""^(8)C_(5)`

`""^(13)C_(10)-""^(5)C_(2)`

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The correct Answer is:

A, B, C, D

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