Question

How many terms of G.P. 3, 32, 33, … are needed to give the sum 120?​

Answer 1

Answer:

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Answer 2

Explanation:

let A1=3

a²=32

r=?

for finding r :

r=A1/A2

r=3/32

r=0.093

G.P= 3,32,33......

Sn=120

let's substitute in the formula:

a(r power n - 1)/ r-1

3(0.093 power 120 -1)/0.093-1