Five cards - the ten, jack, queen, king and ace of diamonds, are well-shuffled with their face downwards. One card is then picked up at random. If the queen is drawn and put a side, what is the probability that the second card picked up is (a) an ace? (b) a queen?
Given:
Five cards - the ten, jack, queen, king and ace of diamonds, are well-shuffled with their face downwards.
One card is then picked up at random.
The queen is drawn and put aside.
To do:
We have to find the probability that the second card picked up is (i) an ace (ii) a queen.
Solution:
A queen is drawn and put aside.
This implies,
Total number of remaining cards $=4$
The total number of possible outcomes $n=4$.
(i) Number of cards that are ace $=1$
Total number of favourable outcomes $=1$.
We know that,
Probability of an event $=\frac{Number\ of\ favourable\ outcomes}{Total\ number\ of\ possible\ outcomes}$
Therefore,
Probability that the second card picked up is the ace $=\frac{1}{4}$
(ii) Number of cards that are queen $=0$
Total number of favourable outcomes $=0$.
Therefore,
Probability that the second card picked up is a queen $=\frac{0}{4}=0$
The probability that the second card picked up are the ace and the queen are $\frac{1}{4}$ and $0$ respectively.
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