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The coefficient of x4 in the expansion of (1 + x–2), where |x|<1(a) –5 (b) –3 (c) 4 (d) 5 |
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Answer» Answer : (d) 5 (1 + x) –2 = 1 – 2x + 3x2 – 4x3 + 5x4 ⇒ Coefficient of x4 in the expansion of (1 + x)–2 = 5. |
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