Question

How many terms in the GP 4, 3.6, 3.24, ... are needed so that the sum exceeds 35?​

Answer 1

Answer:

R=0.9 and a=4, so 0.1*35/4 (which is 3.5/4, or 7/8) = 1 - 0.9^n. n = ln(0.125)/ln(0.9) = 19.73, so 20 terms will suffice.

Step-by-step explanation:

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Answer 2

Answer:

R=0.9 and a=4, so 0.1*35/4 (which is 3.5/4, or 7/8) = 1 - 0.9^n. n = ln(0.125)/ln(0.9) = 19.73, so 20 terms will suffice.