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There are 4 suits in a deck of cards; each suit has a probability of being selected of 1/4. So, probability of a diamond is 1/4 or 0.25.
The formula for finding probability depends on the distribution function.
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The probability of drawing a 10 or a diamond out of 52 cards is 16 in 52, or 4 in 13. There are 4 tens and 13 diamonds, but one ten is also a diamond, so there are 16 cards that are a ten or a diamond.
If you draw 40 cards without replacement the probability is 1! If you draw just one, the probability is 1/4.