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Find a positive value of m for which the coefficient of x2 in the expansion (1 + x)m is 6. |
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Answer» Given 6 = coefficient of x2 in (1 + x)m = mC2 ∴ 6 = m(m - 1)/(2 x 1) ⇒ m(m - 1) = 12 = 4(3) ∴ m = 4 |
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