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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