The common ratio of a G.P. is 2. If the 5th term is greater than the 1st term by 45, find the 5th term,
a = 1st term ; ar\(^4\) = 5th term ∴ ar\(^4\) = a(2)\(^4\) = 16a; 16a = 45 + a, a = 3; 3(2)\(^4\) = 48
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