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प्रश्न
Find the number of words formed by permuting all the letters of the following words:
RUSSIA
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उत्तर
This word consists of 6 letters that include two Ss.
The total number of words is the number of arrangements of 6 things, of which 2 are similar to one kind.
⇒\[\frac{6!}{2!}\]= 360
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