Answer:
9 number is composite is answer
Step-by-step explanation:
1,3,9 can be exactly divided by
I hope this is helpful!
Answer:
Both, you and your friend, are correct.
Step-by-step explanation:
5 P 5 = 5!
A shortcut I learned is that in the permutation equation nPn when n is the same on both sides, it is equal to if you used factorial, n!.