1.

A fair coin is tossed n times and x be the number of heads. If P(x=4), P(x=5), P(x=6) are in A.P. then which of the following are correct. Statement-I : n = 7Statement-II : n = 9 Statement-III : n = 2Statement-IV : n = 14 correct statements are

Answer»

only I
both I and III
both III and IV
both I and IV

Answer :D


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