1. Your father will be attending a week-long seminar. He packed 4 different suits, 7 polo shirts, and 5 pairs of shoes. In how many ways can he wear a suit, a polo shirt, and a pair of shoes?

2. You just opened a saving account. You must choose a four-digit PIN for your ATM card. Each digit must be a number between 0 and 9. How many different possible PIN can you choose if the bank does not allow zero as the first digit of your PIN?

3. Seven contestants are in the final round of a singing contest. How many different ways are there to award the first, second, and the third prizes?

4. How many arrangements can be formed using all the letters in the word MUSICAL?

5. Twelve people will arrange themselves in a line for a picture. How many different photos can be taken?