the unit digit in the product 1457 * 7863 * 4575 * 9719 is ?
"unit digit in the given product = unit digit in 7 * 3 * 5 * 9 = 5 answer is a"
subtract(multiply(multiply(multiply(1457, 7863), 4575), 9719), subtract(multiply(multiply(multiply(1457, 7863), 4575), 9719), add(const_4, const_4)))