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The coefficient of t4 in the expansion of ((1 - t6)/(1 - t))3 is:(1) 14(2) 15(3) 12(4) 10 |
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Answer» The correct option (2) 15 Explanation: (1 – t6)3 (1 – t)–3 : 6C4 = 15 (coeff. of t4 in (1 – t)–3) |
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