Problem: what is the units digit of ( 5 ! * 5 ! + 6 ! * 5 ! ) / 3 ?
Rationale: "( 5 ! * 5 ! + 6 ! * 5 ! ) / 3 = 5 ! ( 5 ! + 6 ! ) / 3 = 120 ( 120 + 720 ) / 3 = ( 120 * 840 ) / 3 = 120 * 280 units digit of the above product will be equal to 0 answer e"
annotated_formula: divide(add(multiply(factorial(5), factorial(5)), multiply(factorial(5), factorial(5))), 5)