Question 206215
There are 4 cards with a 10: 10 club, 10 diamond, 10 heart, 10 spade
There are 13 diamond cards:

Therefore, the number of ways to get a 10 or a diamond is (4+13)-1=16

There are 52 cards in the deck.

So, the probability is 16/52= <u>4/13</u>

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