Question

1. Find the sum of the following A.Ps.:
(i) 1, 3, 5, 7, ........... to 25 terms

how to solve by steps​

Answer 1

Answer:

a=1,d=3-1=2

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

S25=25/2 (1

Answer 2

Answer:

By using the formula S=n/2(2a+(n-1)d)

Step-by-step explanation:

n=25

a=1

d= 3-1 = 2

Sum(25 terms)=n/2(2a+(n-1)d)

=25/2(2×1+(25-1)2)

=25/2(2+48)

=25/2×50

=25×25

=625(sum of 25 terms)

Hope this helped you!