Question

Sum to n terms the following series:
a) 1x1 + 2x3 + 3x5 + 4x7 + ……
b) 3x8 + 6x11 + 9x14 + 12x17 + ……
c) 1x3x5 + 3x5x7 + 5x7x9 + ……..
d) 22 + 52 + 82 + 112 + …….

Answer 1

$1 \times 1 + 2 \times 3 + 3 \times 5 + 4 \times 7$