IBM Company Numerical Ability Permutation and Combination

How many ways can 10 letters be posted in 5 post boxes, if each of the post boxes can take more than 10 letters?

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IBM Other Question

In how many ways can the letters of the word EDUCATION be rearranged so that the relative position of the vowels and consonants remain the same as in the word EDUCATION? How many numbers are there between 100 and 1000 such that atleast one of their digits is 6?