Advertisements
Advertisements
प्रश्न
Find the rank of the word ‘CHAT’ in the dictionary.
उत्तर
The letters of the word CHAT in alphabetical order are A, C, H, T. To arrive the word CHAT, first, we have to go through the word that begins with A. If A is fixed as the first letter remaining three letters C, H, T can be arranged among themselves in 3! ways. Next, we select C as the first letter and start arranging the remaining letters in alphabetical order. Now C and A is fixed remaining two letters can be arranged in 2! ways. Next, we move on H with C, A, and H is fixed the letter T can be arranged in 1! ways.
∴ Rank of the word CHAT = 3! + 2! + 1! = 6 + 2 + 1 = 9
APPEARS IN
संबंधित प्रश्न
Evaluate `(n!)/((n-r)!)`, when n = 9, r = 5
Write the number of 5 digit numbers that can be formed using digits 0, 1 and 2 ?
The number of different signals which can be given from 6 flags of different colours taking one or more at a time, is
The product of r consecutive positive integers is divisible by
If (n+2)! = 60[(n–1)!], find n
A student appears in an objective test which contain 5 multiple choice questions. Each question has four choices out of which one correct answer.
What is the maximum number of different answers can the students give?
How many strings are there using the letters of the word INTERMEDIATE, if all the vowels are together
If all permutations of the letters of the word AGAIN are arranged in the order as in a dictionary. What is the 49th word?
There are 10 persons named P1, P2, P3, ... P10. Out of 10 persons, 5 persons are to be arranged in a line such that in each arrangement P1 must occur whereas P4 and P5 do not occur. Find the number of such possible arrangements.
If 1P1 + 2. 2p2 + 3. 3p3 + ....... 15. 15P15 = qPr – s, 0 ≤ s ≤ 1, then q+sCr–s is equal to ______.
