A bag contains $10$ coloured balls of which $3$ are grey, $5$ are blue and $2$ are red. A ba

Question

A bag contains $10$ coloured balls of which $3$ are grey, $5$ are blue and $2$ are red. A ball is selected at random from the bag. Find the probability of picking either a grey or blue ball from the bag. When $n$ grey balls are added into the bag, the probability of picking a grey ball becomes ${0.5.}$ Find the value of $n$.

Accepted Answer

(a) $\frac45$ (b) $4$

Probability: Picking a Ball from a Bag

Probability: Picking a Ball from a Bag

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