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Indian Statistical Institute and an inherant problem in hashing This is an interesting question formed in Indian Statistical Institute. Let us take it at a different angle. 26 letters of an alphabet from A to Z can have 26^7 combinations, including repeatations. Now, number of combinations that COVFEFE can form is atmost ¬†Factorial (7) / (Factorial (2) * Factorial(2)). Of all the occurances out of these 7 possible combinations of the 7-letter digit COVFEFE, COVFEFE occurs at a particular permutation. Now, alphabetically, C comes before E, and E comes before F. Now, the number of occurances of the word COVFEFE…