The common ratio of a G.P. is 2. If the 5th term is greater than...
MATHEMATICS
WAEC 1991
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
Correct Answer: D. 48
Explanation
a = 1st term ; ar4 = 5th term
? ar4 = a(2)4 = 16a; 16a = 45 + a, a = 3;
3(2)4 = 48
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