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

Question

Quantrex Academy · Accepted Answer

Correct answer: B. 276

Total number of ways aligned & = ^5 C₃ ^8 C₇+ ^5 C₄ ^8 C₆+ ^5 C₅ ^8 C₅ & =10 8+5 28+1 56 & =80+140+56=276 aligned

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

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