There are four 10's in a standard deck of 52 cards.
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There are usually 36 number cards although in some decks there are 32 (the 10s are Ts).
for the diamonds - you have a 1in4 chance (25%) 52 cards in the deck, 13 are diamonds or 13:52=1:4 for the 10s - you have 1in13 chance (7.7%) 52 cards in the deck, 4 are 10s or 4:52=1:13