2022 DHS P2 Q6
(a)
Find the number of ways the letters of the word ABDUCTIONS can be arranged in a circle such that the letters A, O and U must not be next to one another.
[2]
(b)
A five-letter codeword is randomly formed from the word TYRANNOSAUR.
(i) Find the number of codewords that can be formed if it contains at most pair of identical letters.
[3]
(ii) Find the probability that a codeword contains both R’s and both N’s, given that it contains the block of letters “RAN”.
[2]
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