what is the sum of all even integers between 99 and 301 ?
"a = 100 , tn = 300 a + ( n - 1 ) d = 300 = > n = 101 sn = n / 2 ( a + l ) = 101 / 2 ( 100 + 300 ) sn = 20200 answer : a"
multiply(add(divide(subtract(subtract(301, 99), const_2), const_2), 99), divide(add(subtract(301, 99), const_2), const_2))