Question: Roger, Ken, Tom, and Jay are going to play golf. They will randomly select teams of two players each. List all possible team combinations. That

Roger, Ken, Tom, and Jay are going to play golf. They will randomly select teams of two players each. List all possible team combinations. That is, list all the combinations of the four people Roger, Ken, Tom, and Jay taken two at a time. What is ₄C₂?

Approach List the possible teams. Note that order is unimportant, so {Roger, Ken} is the same as {Ken, Roger}.

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