Here, we are required to determine the number of ways by which Todd can choose 3 cards from 7 different baseball cards.
3 of these cards can be chosen from the 7 different baseball cards in 35 ways.
The mathematics of choosing/selecting is associated with Combinations.
Therefore, 3 cards can be chosen from 7 cards in:
⁷C3 = (7!)/(7-3)!×3! = 35.
Therefore, 3 of these cards can be chosen from the 7 different baseball cards in 35 ways.
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