+0

# Help

0
117
2
+73

Our approach is to write T as a geometric series in terms of S and r.

Give a closed form expression for T in terms of r.

Let,

$$|r| < 1, S = \sum_{k=0}^{\infty} r^k, T = \sum_{k=0}^{\infty} k r^k.$$

amandapaolars  Mar 20, 2018
edited by Guest  Mar 20, 2018
#1
0

Can you translate it into "plaintext"??

Guest Mar 20, 2018
#2
+73
0