1+3+5+7+9+11+13+15+17+19​ is

Answers (1)
S safeer

First-term a=1

last term l=19

number of terms n =10

1, 3 , 5 , 7......,19 are in AP

Sum = 0.5n(a+l)=0.5x10(1+19)=100

 

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