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Q.

Sum of the last 30 coefficients in the expansion of (1 + x)59, when expanded in ascending powers of x is

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a

259

b

258

c

230

d

229

answer is B.

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Detailed Solution

c0  59+c1  59+........c29  59+c30+c31  59+.......c59  59  59=2592c30+c31  59+c32  59+.......c59  59  59=259Required=258

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Sum of the last 30 coefficients in the expansion of (1 + x)59, when expanded in ascending powers of x is