Johnny has 7 different colored marbles in his bag.  In how many ways can he choose three different marbles from his bag to play a game?
Question:
Johnny has 7 different colored marbles in his bag.  In how many ways can he choose three different marbles from his bag to play a game?
Answer:
Let's think step by step.

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Johnny has 7 different colored marbles in his bag.  In how many ways can he choose three different marbles from his bag to play a game?
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