John has 12 marbles of different colors, including one red, one green, and one blue marble. in how many ways can he choose 4 mar
bles, if exactly one of the chosen marbles is red, green, or blue?
2 answers:
Answer:
252
Step-by-step explanation:
AoPs
3 ways (uncertain)
1 red or blue or green + 3 other colours
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