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

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

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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

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The number of irrational terms in the expansion of is

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The coefficient of x^-17 in the expansion of is