Question

Find the number of $4$ letter words, with or without meaning, which can be formed out of the letters of the word , where the repetition of the letters is not allowed.

• A. $22$
• B. $24$
• C. $26$
• D. $28$

Answer 1

Answer: (B)

$24$

Answer 2

There are as many words as there are ways of filling in 4 vacant places by the $4$ letters, keeping in mind that the repetition is not allowed. Thus, the number of ways in which the $4$ places can be filled, by the multiplication principle, is $4 \times 3 \times 2 \times 1 = 24$. Hence, the required number of words is $24$.