The probability of getting the letter M or T, and a number less than 10 is: 12/55
On the first bag there are 11 tiles, such that 2 of these tiles have the letter M and 2 of the tiles have the letter T.
Then, 4 out of the 11 tiles have the letters M or T, so the probability of getting one of these letters is:
P = 4/11.
In the other bag there are 15 tiles, and the numbers less than 10 are {1, 2, 3, 4, 5, 6, 7 ,8, 9}
So 9 out of the 15 tiles meet the condition, then the probability of getting a number less than 10 is:
Q = 9/15 = 3/5
The joint probability is given by the product between the individual probabilities, so the probability of getting the letter M or T, and a number less than 10 is:
p = P*Q = (4/11)*(3/5) = 12/55
If you want to learn more about probability:
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