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Question
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.
Solution
Let S be the sample space of drawing a card from a well-shuffled deck.
`n(S)=""^52C_1=52`
(i)There are 13 spade cards and 4 ace's in a deck As ace of spade is included in 13 spade cards,so there are 13 spade cards and 3 ace's
A card of spade or an ace can be drawn in
`""^13C_1+""^3C_1=13+3=16`
Probability of drawing a card of spade or an ace=16/52=4/13
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