SOLUTION: Deret geometri 2+2^2+2^3+....+2^n=254, n=....?

Question 398083: Deret geometri 2+2^2+2^3+....+2^n=254, n=....?
Answer by Tatiana_Stebko(1539) (Show Source): You can put this solution on YOUR website!
sum of the n numbers in a geometric progression

a=2, r=2
S=254

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