how many numbers between 400 and 1000 can be made with the digits 2 , 3,4 , 5,6 and 0 ?
"required number = 3 * 5 p 2 = 3 * 20 = 60 answer is b"
subtract(divide(1000, multiply(multiply(2, 3,4), 5,6)), divide(400, multiply(multiply(2, 3,4), 5,6)))