COCHIN is permuted.....................................

The letters of the word COCHIN are permuted and all the permutations are arranged in an alphabetical order as in an English dictionary. The number of words that appear before the word COCHIN is:

48 96 192 360

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2 solutions

Mudit Jha
Jul 8, 2014

Arranging alphabetically, the first word in the list of permutations of COCHIN will be " CCHINO'. Keeping the two Cs at the start fixed in the place, we see that there are 4! = 24 words which have two Cs at the start. Similarly there will be 24 more for the pattern CH..., 24 more for CI... and then 24 more for CN....

The very next word will have CO as the first two letters and is COCHIN. Hope this helps.

brilliant!!!!!!!

Adarsh Kumar - 6 years, 10 months ago
Nicolas Bryenton
Jul 24, 2014

There are no letters in our word "COCHIN" That come before C, so the first letter must be C. All the remaining letters (OCHIN), with the exception of "O", come before "O" and are therefore options for the next letter. There are 4 such letters. The next four letters are just a permutation of the 4 letters that will remain. 1 option for the first letter in our word, 4 for the second, 4 for the third, 3 for the fourth, 2 for the fifth and 1 for the sixth.

1 × 4 × 4 × 3 × 2 × 1 = 96 1 \times 4 \times 4 \times 3 \times 2 \times 1 = 96

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