You are choosing numbers from the set S=A, B, C, D, E, F, G, H). Let x= the number of ways to choose 3 letters from S without replacement (order doesn't matter).
Which option below is equivalent to X?
The number of ways to choose 5 letters from S without replacement
The number of ways to choose 4 letters from S without replacement
The number of ways to choose 6 letters from S without replacement
The number of ways to choose 7 letters from S without replacement