What is the probability of drawing the ace of spades?

USING PERMUTATIONS AND COMBINATIONS

total number of cases : 52C13

favorable cases : (52-1)C13 = 51C13

P (of not drawing an ace of spades) = 51C13/52C13

= 3/4

odds against this question is : 3/(4-3)

= 3/1 [ANS.]