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,
greater than the 1st term by 45, find the 5th term,
- A.
3 - B.
6 - C.
45 - D.
48 - E.
90
Correct Answer: Option D
Explanation
a = 1st term ; ar^{4} = 5th term
∴ ar^{4} = a(2)^{4} = 16a; 16a = 45 + a, a = 3;
3(2)^{4} = 48