For G.P if a=3 r=2 then S10=....
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sum of first 10 terms =a1(1-r^n)/(1-r)
S=3(1-2^10)/1-2)
S=3(-1023)/-1
S=3069
S=3(1-2^10)/1-2)
S=3(-1023)/-1
S=3069
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