the unit digit in the product ( 445 * 534 * 999 * 234 ) is :
"explanation : unit digit in the given product = unit digit in ( 5 * 4 * 9 * 4 ) = 0 answer : b"
subtract(multiply(multiply(multiply(445, 534), 999), 234), subtract(multiply(multiply(multiply(445, 534), 999), 234), add(const_4, const_4)))