Question

1 point
9. If Pr stands for "P, then the sum of the series 1 + P + 2P2 + 3P3 + +nPn is
1) P-1
2) Pn+1-1
3) Pn-1+1 4) P-1)
O 1
O 2​

Answer 1

Answer:

first you write question correctly