a. Find the first four terms, in ascending powers of x, of the binomial expansion of (1

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a. Find the first four terms, in ascending powers of x, of the binomial expansion of (1 + qx)10, where q is a non-zero constant.

b. Given that in the expansion of (1 + qx)10 the coefficient of x3 is 108 times the coefficient of x, work out the value of q.

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