Asked by kamraan
first term of geometric sequence is 1/2 and 9th term is 128 what will be the sum of 15 terms
Answers
Answered by
oobleck
r^8 = 256
r = ±2
S15 = 1/2 (r^15 - 1)/(r-1)
r = ±2
S15 = 1/2 (r^15 - 1)/(r-1)
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