A card is drawn from an ordinary pack of 52 cards and a gambler bets that, it is a spade or an ace. What are the odds against his wining this bet?

Explanation

P(A)=16/52=4/13

odd=P(B)=P(`overlineA`)

`(P(overlineA))/(P(A))=(1-P(A))/(P(A))`
`=(1-4/13)/(4/13)`

`=9/4`.