Some white balls put in a basket containing twelve red balls and sixteen black balls....
MATHEMATICS
JAMB 2004
Some white balls put in a basket containing twelve red balls and sixteen black balls. If the probability of picking a white balls from the baskets is 3/7, how many white balls were introduced?
- A. 12
- B. 21
- C. 28
- D. 32
Correct Answer: B. 21
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