the sum of the first 50 positive even integers is 2550 . what is the sum of the even integers from 402 to 500 inclusive ?
"2 + 4 + 6 + 8 + . . . + 100 = 2550 402 + 404 + . . . + 500 = 50 ( 400 ) + ( 2 + 4 + . . . + 100 ) = 20,000 + 2550 = 22,550 the answer is c ."
multiply(divide(add(500, 402), const_2), add(divide(subtract(500, 402), const_2), const_1))