1.

Find a positive value of m for which the coefficient of x2  in the expansion (1 + x)m is 6.

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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