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Number of permutations of n distinct objects taken n at a time (arrangements) is given by P=n! In this case 7!
However the 2 O are not distinguishable one from the other. The number above must be divided by 2!
Similarly the two L are not distinguishable one from the other. Theresult above must be divided by 2! Finally, the total number of permutations of the letters in HOLLOW is 7!/(2!*2!)=1260
Sorry I miscounted the number of letter in the word HOLLOW. Replace 7 by 6. The number is 180 rather than 1260.Sorry I miscounted the number of letter in the word HOLLOW. Replace 7 by 6. The number is 180 rather than 1260.
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