(a) If the coefficient of $x^2$ and $x^3$ in the expansion of $(p+qx{)}^7$ are equal, express q in terms of p.
(b) A man makes a weekly contribution into a fund. In the first week, he paid N180.00, second week N260.00, third week N340.00 and so on. How much would he have contributed in 16 weeks?


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