find the sum of first r terms of the series
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When n=1 ,2.3^n-1=2.3^1-1=2+1=3
When n=2, 2.3^n-1=2.3^2-1=6+1=7
When n=3, 2.3^n-1=2.3^3-1=18+1=19
When n=4, 2.3^n-1=2.3^4-1=54+1=55
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And so on....
So its clearly a G. P
When n=2, 2.3^n-1=2.3^2-1=6+1=7
When n=3, 2.3^n-1=2.3^3-1=18+1=19
When n=4, 2.3^n-1=2.3^4-1=54+1=55
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.
.
And so on....
So its clearly a G. P
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