In how many ways can the letters of the word "THURSDAY" be arranged so that R, S, D always occur together?
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Answer:
6720
Step-by-step explanation:
Case 1-if letters are repeated then
No. Of words=8*8*8*8*8=8^5
Case 2-if letters are not repeated then
No. of words=8*7*6*5*4=6720
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