Finds Sn for each of the geometric a=2,t6=486,n=6
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Here a=2,t6=486,n=6
Now t6=2(r)5=486
⇒r5=243
⇒r=3.
Now, Sn=r−1a(rn−1) if r=1
Thus, S6=3−12(36−1)=36−1=728
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