The factorial of a number is the product of all the integers from 1 to that number. Factorial is not defined for negative numbers and the factorial of zero is one. So, n ! = n n - 1 n - 2 . . . . . . . . . 1 We need to evaluate 8 ! ⇒ 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 4 0320 Therefore, value of 8 ! is 40320 .

The factorial of a number is the product of all the integers from 1 to that number. Factorial is not defined for negative numbers and the factorial of zero is one. So, n ! = n n - 1 n - 2 . . . . . . . . . 1 We need to evaluate 4 ! - 3 ! ⇒ 4 ! = 4 × 3 × 2 × 1 = 24 , 3 ! = 3 × 2 × 1 = 6 Therefore, 4 ! - 3 ! = 24 - 6 = 18

The factorial of a number is the product of all the integers from 1 to that number. Factorial is not defined for negative numbers and the factorial of zero is one. So, n ! = n n - 1 n - 2 . . . . . . . . . 1 . Therefore, 3 ! = 3 × 2 × 1 = 6 and 4 ! = 4 × 3 × 2 × 1 = 24 . Hence, 3 ! + 4 ! = 6 + 24 = 30 Whereas, 7 ! = 7 × 6 × 5 × 4 × 3 × 2 × 1 = 5040 . Therefore, 3 ! + 4 ! ≠ 7 !