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Four cards are drawn from a pack of 52 cards without replacement. Find the probability that all of them are jack.

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The correct Answer is:
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Probability that first card drawn is a jack `=4/52=1/13`
This card is not replaced in the pack. Now there remains 51 cards in the pack in which 3 are jack.
Probability that 2nd card drawn is jack `=3/51=1/17`
Similarly,
Probability that 3rd card drawn is jack `=2/50=1/25`
and the probability that 4th card drawn is jack `=1/49`
These four events are independent events.
Therefore, the required probability
`=1/13xx1/17xx1/25xx1/49`
`=1/270725`
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