Question

The Sum of first_____ term of an A.P. 1,3,5,....is 100​

Answer 1

Step-by-step explanation:

Gn:

AP=1,3,5,.........

a= 1 ,d=2

Sn=100

Sn=n/2[2a+(n-1)d]

100=n/2[2×1+(n-1)2]

200=n[2+2n-2]

200=2n^2

2n^2=200

n^2=100

n=10

• Answer:10

• Hope it helps you