1. Seven cards, each bearing a letter, can be arranged to spell the word “DOUBLES”. How many
three-letter code-words can be formed from these cards ?
How many of these words
(i) contain the letter S; (ii) do not contain the letter O;
(iii) consist of a vowel between two consonants?
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Answer:
i) Sob,Bus,Sub
ii)Bus,Sub,Led
iii)Sob,Bus,Led
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