Question

odd numbers till 139 (add)

Answer 1

By adding we get the answer as 4900

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Answer 2

Answer:

Sum of n odd =n²

number of odd number till x (when x is odd) =(n+1)/2

number of odd number till x (when x is even)

=n/2

so their are 70 odd number till 139

and their sum is 70²=4900