Question

Sum of all terms of the series -3, -1, 3, 5.... 51

Answer 1

Answer:

n=a+(n-1)d

51=-3+(n-1)2

51=-3+2n-2

51+5=2n

n=56÷2

n=28

Sn=n÷2(a+l)

Sn=28÷2(-3+51)

Sn=14*48

Sn=672

sum of all terms of the series=672