1. In how many ways can 3 identical emeralds, 2 identical diamonds, and 2 different opals be arranged in a row in a display case?

Is the solution 3 x 2 x 2 =12

2.Find the number of 6-letter permutations that can be formed from the letters i n the world shopper.

C (7,6) =7

3. How many 13-card hands having exactly 10 spades can be dealt?

Thank you very much.