Find the nth term of a series in G.P 1,2,4,8..
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q=2/1 =2
a1=1
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an=a1q^n-1 = 1* 2^n-1 = 2^(n-1)
a1=1
...................
an=a1q^n-1 = 1* 2^n-1 = 2^(n-1)
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