1st and 8th term of GP are 4 and 512 find the common ratio and the sum of its first 5 terms
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8th term = a x R^(n-1)
512 =4 x R^(7)
2^7 = R^7
hence R=2
sum of first 5terms::
4(2^4-1)/(2-1) = 60
512 =4 x R^(7)
2^7 = R^7
hence R=2
sum of first 5terms::
4(2^4-1)/(2-1) = 60
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