Answers

2016-02-14T17:24:39+05:30

Sm= 2m 2+3m

S1 =10

S2 = 32

a2 = S2 - a1         [S1=a1]

     =72

0
2016-02-15T00:20:59+05:30
Sum of n terms = 2m^2+3m.
Sum of two terms =14d:4, t2:9, pt1:5
Sum of 3 terms = 27t3:13
Sum of 4 terms =44t4:17
series is 5,9,13,17,......
Second term is 9
0