Neco Model Questions Vol1 2024 Mathematics Question 42
Practice objective / multiple choice question 42 from the 2024 Neco Model Questions Vol1 Mathematics examination.
A box contains white, black and yellow balls. The probability of drawing a white ball on the first draw (without replacement) is \(\frac{1}{3}\). If a white ball is drawn and not replaced, the probability that the next ball drawn is black becomes \(\frac{1}{4}\). The box originally holds 21 balls. How many black balls are there?
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About This Question
This is Neco Model Questions Vol1 2024 Mathematics Question 42. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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