CAT Quantitative Aptitude Questions | CAT Permutation and Combination Questions

CAT Questions | Permutation Probability | Rearranging Letters

The question is from Permutation and Combination. This is about Rearranging Letters. We need to find out the number of words that can be formed using the letters given in that particular word. This section hosts a number of questions which are on par with CAT questions in difficulty on CAT Permutation and Combination, and CAT Probability.

Question 16: In how many ways can letters the word ATTITUDE be rearranged such that no two Ts are adjacent to each other?

  1. 6720
  2. 2400
  3. 4320
  4. 1800

Best CAT Online Coaching
Try upto 40 hours for free
Learn from the best!

2IIM : Best Online CAT Coaching.

Video Explanation

Best CAT Coaching in Chennai

CAT Coaching in Chennai - CAT 2022
Limited Seats Available - Register Now!

Explanatory Answer

Method of solving this CAT Question from Permutation and Combination: To answer this one, you should first know the number of arrangements in which the T's are together!!

ATTITUDE has 8 letters, of which 3 are Ts
Now, let us place the letters that are not Ts on a straight line. We have AIUDE. These can be arranged in 5! ways.
Now let us create slots between these letters to place the Ts in.
In order to ensure that no two Ts are adjacent to each other, let us create exactly one slot between any two letters.

A __ I __ U __ D __ E
Additionally, let us add one slot at the beginning and end as well as the Ts can go there also.
__A __ I __ U __ D __ E__
Now, out of these 6 slots, some 3 can be T. That can be selected in 6C3 ways.
So, total number of words = 5! × 6C3 = 2400.

The question is "In how many ways can letters the word ATTITUDE be rearranged such that no two Ts are adjacent to each other?"

Hence the answer is "2400"

Choice B is the correct answer.


CAT Preparation Online | CAT Permutation and Combination; Probability Videos On YouTube

Other useful sources for Permutation and Combination Questions | Probability Questions

CAT Questions | CAT Quantitative Aptitude

CAT Questions | CAT DILR

CAT Questions | Verbal Ability for CAT

Where is 2IIM located?

2IIM Online CAT Coaching
A Fermat Education Initiative,
58/16, Indira Gandhi Street,
Kaveri Rangan Nagar, Saligramam, Chennai 600 093

How to reach 2IIM?

Phone: (91) 44 4505 8484
Mobile: (91) 99626 48484
WhatsApp: WhatsApp Now