how many numbers from 2 to 15 are exactly divisible by 2 ?
"2 / 2 = 1 and 15 / 2 = 7 7 - 1 = 6 6 + 1 = 7 numbers . answer : d"
add(divide(subtract(multiply(floor(divide(15, 2)), 2), multiply(add(floor(divide(2, 2)), const_1), 2)), 2), const_1)