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Q.

A die is thrown (2n+1) times. The probability of getting 2 or 5 or 6 atmost n times is

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a

1n

b

12n+1

c

n2n+4

d

12

answer is D.

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Detailed Solution

p=36=12  ,  q=12 p(X≤n)=  ( 2n+1C0+ 2n+1C1+......+2n+1Cn)12n+1=12
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