the unit digit in the product ( 611 * 704 * 912 * 261 ) is :
"explanation : unit digit in the given product = unit digit in ( 1 * 4 * 2 * 1 ) = 2 answer : a"
subtract(multiply(multiply(multiply(611, 704), 912), 261), subtract(multiply(multiply(multiply(611, 704), 912), 261), add(const_4, const_4)))