An unbiased coin is tossed n times. Let X denote the number of times head occurs. If `P(X=4), P(X=5) and P(X=6)` are in A.P, then the value of n can be

An unbiased coin is tossed 'n' xx.Let the randon variable X denote the number of xx the head occurs.If P(X=1),P(X=2) and P(X=3) are in AP, find the value of n .

A fair coin is tossed 99 times. Let x be the number of times heads occurs. Then P(X=r) is maximum when r is .

A fair coin is tossed 3 times. Let X be the number of heads obtained. Find E(X) and V(X).

Let X denote the number of xx heads occur in n tosses of a fair coin.If P(X=4),P(X=5) and P(X=6) are in AP; the value of n is 7,14 b.10,14 c.12,7 d.14,12

If coefficient of 9th, 10th and 11th terms of (1+x)^(n) are in A.P., then the value of n can be

A fair coin is tossed 99 times. If X is the number of times in which head occurred, then P(X = r) is maximum when r is equal to