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Q.

In an election, the number of candidates is one greater than the persons to be elected. If a voter can vote in 254 ways, the number of candidates is

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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
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a

7

b

8

c

10

d

6

answer is C.

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Detailed Solution

Let there be n candidates. Then

 nC1+nC2+⋯+nCn−1=254⇒2n−2=254 or  2n=28 or n=8

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