Asked by Daniel mulwa
The 4th term of a geometric sequence is 192.if the first term is 3 then find the common ratio and the number of terms that will give a sum of 255
Answers
Answered by
oobleck
3r^3 = 192
so r = 4
So now find n such that
3(4^n - 1)/(4-1) = 255
so r = 4
So now find n such that
3(4^n - 1)/(4-1) = 255
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