## ParthKohli \begin{aligned}n&:=2 + 4 + 8 + 16 \cdots\\ \iff n&= 2(1 + 2 + 4 + 8 + 16)\cdots \\ \iff n &= 2(n + 1) \\ \iff n & = -1\end{aligned} one year ago one year ago

1. nitz

the sum is a/r-1 2/2-1 2

2. nitz

its an infinte gp series

3. rajathsbhat

^yeah. and that's why you cannot subtract 2n and n to get n. It's like saying $2\infty -\infty = \infty$ you just can't do that.