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Permutation and Combination - Quant/Math - CAT 2009
Question 4 the day:
September 08, 2003
The question for the day is from the topic of Permutation and Combination.
- If the letters of the word CHASM are rearranged to form 5 letter words such that none of the word repeat and the results arranged in ascending order as in a dictionary what is the rank of the word CHASM?
| (1) |
24 |
| |
(2) |
31 |
| (3) |
32 |
| |
(4) |
30 |
Correct Answer - (3)
Solution:
The 5 letter word can be rearranged in 5! Ways = 120 without any of the letters repeating.
The first 24 of these words will start with A.
Then the 25th word will start will CA _ _ _. The remaining 3 letters can be rearranged in 3! Ways = 6. i.e. 6 words exist that start with CA.
The next word starts with CH and then A, i.e., CHA _ _. The first of the words will be CHAMS. The next word will be CHASM.
Therefore, the rank of CHASM will be 24 + 6 + 2 = 32.
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