The probability of drawing a red spade is zero. There are no red spades in a standard deck.
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Since there are 13 spades and 52 cards, the probability is 13/52 or 1/4=.25
The probability of drawing a spade from a standard deck of 52 cards is 13 in 52, or 1 in 4, or 0.25.
The probability that it is a spade when drawn is 13/52 or 1/4.
This is the same as the probability of choosing either a red of a blue marble. There are 5+4 out of 15 ways of doing this. The probability is therefore 9/15 = 3/5.
It is 1/2.