The number of arrangements of the letters of the word BANANA in which two N's do not appears adjacently?
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Step-by-step explanation:
Total no of words BANANA =6
Total no of arrangement =6!3!2!
⇒60
Numbers of words in which two N are together =5!3!
⇒20
∴ Numbers of words in which two N are no together=60−20
⇒40
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