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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

The probability for an event to happen, P(x), can be computed by P(x) = number of favorable outcomes/number of possible outcomes.

That being said, in this probllem our number of favorable outcomes is 2, having 2 T's in the problem. And the number of possible outcomes is 10, having 10 letters in the word arithmetic.

Thus, P(x) = 2/10 = 1/5 = 0.2 = 20%

Hope this helps :) p.s. If there is a part of my solution that you did not understand, please do not hesitate to contact me and I'll be more than glad to explain it to you thoroughly