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2. (a). Find the coefficient of a 62 in the expansion of (a + 26)n. (b). Find the coefficient of ab2n in the expansion

2. (a). Find the coefficient of a "62" in the expansion of (a + 26)n. (b). Find the coefficient of ab2n in the expansion of (2a + b)n (c). Find the coefficient of 25 in the expansion of (x+3)5n. (d). Find the coefficient of x5 in the expansion of (2 + x) 5n. (e). Find the coefficient of x" in the expansion of (2x-3)3n. (f). Find the coefficient of x" in the expansion of (2x + 3x)3n.

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