Answer:
6
Step-by-step explanation:
n ! = n(n - 1)(n - 2)..... × 3 × 2 × 1
Given
(n - 1) ! with n = 4, then
(4 - 1) !
= 3 ! = 3 × 2 × 1 = 6
Answer:
16 questions right = 80%
So Peter missed 4 questions.
Hope this helps.
:-)
xcvbnAnswer:
Step-by-step explanation: