Anyone can. help me in this math problem? (Permutation Formula)

1. In how many ways can 2 men and 3 women students line up in a canteen courter?

2. A volt consists of 5 letters and 4 number. How many possible lock codes are there if
a. no repetition of letters and numbers is allowed?
b. repetition of letters and numbers not allowed?

3. In how many ways can 9 horses be arranged in a merry-go-round?

4. SCIS will conduct a online beauty pageant "Search for Bininbing Sipnayan". For this year, 11
students join on the said event. In how many ways can 3rd runner up, 2nd runner up 1st runner
up and the title holder be selected?

5. How many distinct arrangement can be formed from the letters and numbers of following
a. COMMITTEE
b. MISSISSIPPI
c. BOOKKEEPER
d. TATTLER
e.6,563,656​​