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If a and b denote the sum of the coefficients in the expansions of (1-3x+10x2)n and (1 + x2)n respectively, then write the relation between a and b. |
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Answer» Given : (1-3x+10x2)n Sum of coefficients = a a = (1 - 3 + 10)n =(23)n =(2n)3 (1+x2)n Sum of coefficients = b b = (1+1)n = 2n Put value of b in a; we get : a = b3 |
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