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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