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
E
90
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
a = 1st term ; ar\(^4\) = 5th term
∴ ar\(^4\) = a(2)\(^4\) = 16a; 16a = 45 + a, a = 3;
3(2)\(^4\) = 48
Source: Myschool Past Questions Archive (Record #22917)