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    In this case, if there are 8 possibilities to arrange 2 characters in 4 letter word... then agreed.

    And we can chose those 2 characters in 26 * 25 different ways.

    then the answer should be be 26 * 25 * 8 = 5200.

    Is not it? Can someone explain how the input 4 2 giving output of 2600? Did I not understood the problem well?