A geometric sequence whose first term = 256 and whose common ratio is 0.75. Find the smallest number of n for which the sum of the first n terms of the sequence exceeds 1000.
My turn:
Sn=256(1−(0.75)n)1−0.75>1000
nlog0.75<log3128
n<13.04 then
n=13
What is wrong with my solution because 13 does not satisfy the requires but 14 does ?
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