math
posted by Anonymous .
What are the odds in favor of drawing a card lower than a 5 from an ordinary deck of cards?

Assuming the ace is not considered a "number" card,
there are 12 such cards (the 2 , 3, or 4 each times 4)
prob of a number card less than 5 = 12/52 = 3/13
prob of NOT a number card less than 5 = 10/13
odds in favour of a card less than 5 = 3 : 10