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Coefficient of x^(m) in the expansion of S = (1 + x)^(2m) + x(1 +·x)^(2m-1) + x^(2)(1 + x)^(2m- 2) + .... +x^(2m) is |
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Answer» `""^(2M)C_(m)+""^(2m+1)C_(m-1)` |
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