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A student is to answer 10 out of 13 ques...

A student is to answer 10 out of 13 questions in an examination such that he must choose at least 4 from the first five questions. The number of choices available to him is

A

346

B

140

C

196

D

280

Text Solution

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The correct Answer is:
3
`{:(,A(5),B(8)),(,4,6),(or,5,5):}`
`therefore` No. of ways `=""^(5)C_(4).""^(8)C_(6)+""^(5)C_(5).""^(8)C_(5)`
=5.28+1.56
=196
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