Problem: the sum of the first 50 positive even integers is 2550 . what is the sum of the even integers from 502 to 600 inclusive ?
Rationale: "2 + 4 + 6 + 8 + . . . + 100 = 2550 502 + 504 + . . . + 600 = 50 ( 500 ) + ( 2 + 4 + . . . + 100 ) = 25,000 + 2550 = 27,550 the answer is b ."
annotated_formula: multiply(divide(add(600, 502), const_2), add(divide(subtract(600, 502), const_2), const_1))