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प्रश्न
From a pack of 52 playing cards, all cards whose numbers are multiples of 3 are removed. A card is now drawn at random. What is the probability that the card drawn is a face card (King, Jack or Queen).
उत्तर १
No. of total cards = 52
Cards removed of 4 colours of multiples of 3
= 3, 6, 9
= 4 × 3
= 12
Remaining cards = 52 – 12 = 40
No. of face cards = 12 cards
`=>` Probability P(E) = `12/40 = 3/10`
उत्तर २
The numbers which are multiples of 3 in 52 playing cards are 3, 6 and 9 i.e., 3 cards of each denomination.
∴ All cards whose numbers are multiples of 3 are = 4 × 3 = 12 cards ...(Jack, Queen and King of each denomination)
Remaining cards = 52 – 12 = 40
Now, Number of face cards = 12
P(face card) = `12/40 = 3/10`.
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