Question
Download Solution PDFFind the sum of 4 terms in a GP, given first term is 15 and common ratio is 4.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
First term of GP = 15
Common ratio of GP = 4
Formula used:
\(S_n=a_1\times \dfrac{(r^n-1)}{(r-1)}\)
Calculation:
\(S_4=15\times \dfrac{(4^4-1)}{(4-1)}\) \(= \dfrac{15\times 255}{3} = 1275\)
∴ The answer is 1275 .
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