The odds against drawing a black 7 is 25 in 26.
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The odds are 1 to 25.
12 in 13
The probability of drawing a 4, 5, 6, 7, or 8 of spades is 5 in 52. The probability of not drawing a 4, 5, 6, 7, or 8 of spades, therefore, is (52-5) in 52, or 47 in 52, or about 0.9038.
7 to 1
7:1