Math, asked by sudha11dubey, 10 months ago

Without adding, find the sum of: 1 + 3 + 5 + 7 + 9 + 11 +13+15+17

Answers

Answered by Anonymous

1

Answer:

Step-by-step explanation:

a=1

an or l=17

d=3-1=2

an=a+(n-1)d

17=1+(n-1)2

16/2=n-1

8=n-1

n=9

sn=n/2 x (a+l)

=9/2 x (1+17)

=9/2 x 18

=9 x 9

=81

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