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In the expansion of , the term independent of x is

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The middle term in the expansion of is

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If in the expansion of occurs in r^th term, then

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If in the expansion of (1 + y)ⁿ, the coefficients of 5^th, 6^th and 7^th terms are in A.P., then n is equal to

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In the expansion of , the term independent of x is