The common ratio of a G P is 2 If the 5th term ... - WAEC Mathematics 1991 Question
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
3
B
6
C
45
D
48
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Correct Option: D
a = 1st term ; ar4 = 5th term
∴ ar4 = a(2)4 = 16a; 16a = 45 + a, a = 3;
3(2)4 = 48
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