Question

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?​

Answer 1

Answer:

i) Sob,Bus,Sub

ii)Bus,Sub,Led

iii)Sob,Bus,Led