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If the coefficients of 2nd, 3rd and 4th terms in the expansion of (1+x)2n are in AP, show that 2n2−9n+7=0 |
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Answer» If the coefficients of 2nd, 3rd and 4th terms in the expansion of (1+x)2n are in AP, show that 2n2−9n+7=0 |
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