Mark the correct alternative in the following :

If rth term in the expansion of is without x, then r is equal to.

Mark the correct alternative in the following :

If in the expansion of , the coefficient of rth and (r +4) th terms are equal, then r is equal to

Mark the correct alternative in the following :

The term without x in the expansion of is

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If in the expansion of and , the ratio of the coefficients of second and third terms, and third and fourth terms respectively are equal, then n is

Mark the correct alternative in the following :

If A and B are the sums of odd and even terms respectively in the expansion of , then is equal to