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Oksi-84 [34.3K]
3 years ago
5

What is the sum of the n terms of the series 5 10 20 40 . . . ?

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
5 0
Hello,

5+10+20+40+...\\
=5(1+2+2^2+2^3+...+2^{n-1})\\

=5*\frac{5^n-1}{4}

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