The letters of the word LUCKNOW are arranged among themselves. Find the probability of always having NOW in the word.
Pick.
A) 1/31
B) 1/32
C) 1/41
D) 1/42
E) None of these
Explanation :   Since NOW has to always come together, assume it as one single unit. The rest 4 characters can occur in any way. So total no of characters = 5   The required probability will be given by the equation   = No. of words having NOW/Total no. of words   = 5!/7! = 1/42   Answer : 1/42
<result>D</result>
The letters of the word LUCKNOW are arranged among themselves. Find the probability of always having NOW in the word.