the unit digit in the product ( 722 * 774 * 889 * 223 ) is :
"explanation : unit digit in the given product = unit digit in ( 2 * 4 * 9 * 3 ) = 6 answer : c"
subtract(multiply(multiply(multiply(722, 774), 889), 223), subtract(multiply(multiply(multiply(722, 774), 889), 223), add(const_4, const_4)))