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A special deck of 16 cards has 4 that are blue, 4 yellow, 4 green, and 4 red. The four cards of each color are numbered from one to four. A single card is drawn at random.

Answer the following:
1. Show the sample space of the following events

a. B: the card is blue
b. R: the card is red
c. N: the number in the card is at most 2​