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Arrange the expansion of (x^(1//2) + (1...

Arrange the expansion of `(x^(1//2) + (1)/(2x^(1//4)))^n` in decreasing powers of x. Suppose the coefficient of the first three terms form an arithemetic progression. Then the number of terms in the expression having integer powers of x is - (A) 1 (B) 2 (C) 3 (D) more than 3

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