The coefficient of the middle term in the binomial expansion iP powers of x of
(l+ax)" and of (1-ax)" is the same, if a is equal to...
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Coefficient of middle term in (1 + αx)4 = coefficient of middle term in (1 – αx)6 Therefore, 4C2α2 = 6C3(– α)3 => α = - 3/10
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