Sum of odd numbers

Find the sum of all odd integers from 13 to 781.

Correct answer:

s =  152845

Step-by-step explanation:

a1=13 d=2  b=781  b=a1+d (n1)  n=(ba1)/d+1=(78113)/2+1=385  s=n a1+b2=385 13+7812=152845

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