The options are infinite:
Ex:
250 + 250
1 + 499
2 + 498
3 + 497
4 + 496
5 + 495
etc...
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153....
The sum of the odd numbers (from 1) up to to 500 is 62500. The sum of an arithmetic series is given by: sum = 1/2 x number_in_series x (first + last) For the odd numbers from 1 to 500, there is: number_in_series = 250 first = 1 last = 499 which gives the sum as: sum = 1/2 x 250 x (1 + 499) = 62500.
zero + zero = zero
1022
Sum of observations/Number of observations.