the digit in units place of the product 81 x 82 x . . . . . x 89 is
sol . required digit = unit digit in ( 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 ) = 0 . answer a
reminder(factorial(add(floor(divide(89, const_10)), const_1)), const_100)