Question

Find the sum of the following Ap:1,3,5,7.......to 10terms.

Answer 1

HEY MATE, UR ANSWER IS HERE

Given AP = 1 , 3 , 5 , 7..........upto 10 terms

a = 1

d = 3 - 1 = 2

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

Sn = 10/2 (2*1+(10-1)2)

Sn = 5 (2+(9*2))

Sn = 5 (2+18)

Sn = 5*20

Sn = 100

Therefore sum of AP 1,3,5,7.....to 10 terms is 100

Hope it helps u.....

Answer 2

1+3+5+7+9+11+13+15+17+19=100

another way to solve it:-
by following formula :-

n^2
Where n=number if terms
here number of terms =10
=n^2
=10×10
=100

hope it helps you enough my friend


















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