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प्रश्न
A card is drawn at random from a well-shuffled deck of playing cards. Find the probability that the card drawn is a card of spade or an ace.
योग
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उत्तर
Let S be the sample space of drawing a card from a well-shuffled deck.
n(S) = `""^52C_1`
= 52
There are 13 spade cards and 4 aces in a deck. As the ace of spades is included in 13 spade cards, so there are 13 spade cards and 3 aces
A card of spades or an ace can be drawn in
`""^13C_1 + ""^3C_1 = 13 + 3`
= 16
Probability of drawing a card of a spade or an ace = `16/52`
= `4/13`
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