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प्रश्न
Find the number of ways so that letters of the word HISTORY can be arranged as there is no restriction
उत्तर
In the word 'HISTORY', the number of letters is n = 7.
Words in which there is no restriction:
When there is no restriction, the 7 letters of the word 'HISTORY' can be arranged amongst themselves in 7P7 ways.
Hence, the total number of words when there is no restriction = 7P7 = 7!
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