If you can, please give me a hint on how to solve this question or tell me how to solve it. The question is:
From the letters A, B, C, D and E, two different letters are selected at random. Find the probability that these two letters are A and B.
Also, what does this P(T>4) as opposed to this P(T<4) ?
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- Thread Starter
- 03-06-2016 17:00
- 03-06-2016 19:52
So you have P(AB) and P(BA) as a start (you need to find these)...and you don't need perms and coms
Spoiler:ShowP(AB) = 1/5 (there are five letters) x 1/4 (you've removed one so you now have 4 letters) = 1/20Then P(BA) = 1/5 x 1/4 = 1/20So the probability of getting A and B is 1/20 + 1/20 = 1/10
P(T>4) means T is greater than four
P(T<4) means T is less than fourLast edited by nox1; 03-06-2016 at 19:54.