Probability Doubt from Freund

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Probability Doubt from Freund

Ridhika
Hi guys, I was solving the excercies from Freund (7th Edition).. and im not getting the answers at the back of the book for the following questions. Please help!

Q2.63 - 5 balanced die are rolled simultaneously - what is the probability of getting two pairs?

Q2.43(b) - An experiment consists of rollling a die until 3 appears - how many elements of the sample space correspond to the event that 3 appears not later that the kth roll of the die

Thanks a lot! :)