permutation Question help

Question

1.question:if no digit can be repeated, how many numbers can be made from

the digits 2, 3,4,&5 ?(would it be 3,628,800?)

Answer 1

I think if we talking about 4 digits number then this number is P(4) = 4! = 24.

If total numbers then P(4,1) + P(4,2) + P(4,3) + P(4,4) = 4 + 12 + 24 + 24 = 64

Answer 2

4 ways to choose first digit, leaving 3 digits

3 ways to choose second digit, leaving 2 digits

2 ways to choose third digit, leaving 1 digit

1 way to choose 4th digit

4*3*2*1 = 24