Question:medium
From 4 red balls, 2 white balls and 4 black balls, four balls are selected. The probability of getting 2 red balls is:
From 4 red balls, 2 white balls and 4 black balls, four balls are selected. The probability of getting 2 red balls is:
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In multi-color ball problems, group the balls into "Target Color" and "Others" to simplify the combination calculation. It prevents confusion between multiple non-target categories.
Updated On: May 1, 2026
- \( \frac{7}{21} \)
- \( \frac{8}{21} \)
- \( \frac{9}{21} \)
- \( \frac{10}{21} \)
- \( \frac{11}{21} \)
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The Correct Option is C
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