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In the expansion In the expansion of (1 + x)43, the coefficients of the (2r + 1)th and the (r + 2)th terms are equal,

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In the expansion of (1 + x)43, the coefficients of the (2r + 1)th and the (r + 2)th terms are equal, then the value of r, is (a) 14 (b) 15 (c) 16 (d) 17

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