what is the units digit of 13 ^ 4 * 17 ^ 2 * 29 ^ 3 ?
"3 ^ 1 = 3 3 ^ 2 = 9 3 ^ 3 = 7 3 ^ 4 = 1 , it is first digit 7 ^ 2 = 9 , it is second digit 9 ^ 3 = 9 , it is third digit 1 * 9 * 9 = 1 answer : e"
divide(add(multiply(factorial(13), factorial(4)), multiply(factorial(13), factorial(2))), 13)