there's 13 spades in a standard deck but since we're talkin' two decks.. there's 26 spades out of 104 cards.. so you do 26/104 which reduces to 1:4 aka the probability
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1 in four chance.
The probability of NOT drawing a spade from a standard deck of cards is 75 is an example of a mistated question - a standard deck of cards is 52, not 75.
It is 1/169 or 0.0059, approx.
It is 1/4.
13/52 = .25