TMUA Y and A Tutoring Paper 1 with Answers and Hints · Question 17

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Y and A Tutoring Paper 1 with Answers and Hints · Q17

Paper 1Probability

A bag contains exactly $3$ red marbles and $n$ blue marbles (where $n\ge2$ ). Three marbles are drawn at random without replacement.

Given that the probability of drawing exactly $2$ red marbles is equal to the probability of drawing exactly $1$ red marble, what is the value of $n$ ?

2

3

4

5

6

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