What is the value of this expression? the sum from n is equal to 12 to 73 of n

There are 73 − 12 + 1 = 62 integers from 12 through 73. Pairing the first and last terms gives an average of (12 + 73) ÷ 2 = 42.5, so the sum is 62 × 42.5 = 2,635. The correct choice is 2,635.

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