how many numbers from 2 to 9 are exactly divisible by 2 ?
"2 / 2 = 1 and 9 / 2 = 4 4 - 1 = 3 3 + 1 = 4 numbers . answer : d"
add(divide(subtract(multiply(floor(divide(9, 2)), 2), multiply(add(floor(divide(2, 2)), const_1), 2)), 2), const_1)