शब्द (REFER) में (R) दो बार और (E) दो बार आता है। अलग व्यवस्थाएँ कितनी होंगी?
In the word (REFER), (R) occurs twice and (E) occurs twice. How many distinct arrangements are possible?
Explanation opens after your attempt
A. (30)
Concept
The arrangements are \(\frac{5!}{2!2!}=30\). Do not count identical letters as different.
Why this answer is correct
The correct answer is A. (30). The arrangements are \(\frac{5!}{2!2!}=30\). Do not count identical letters as different.
Exam Tip
व्यवस्थाएँ \(\frac{5!}{2!2!}=30\) होंगी। समान अक्षरों को अलग-अलग न गिनें।
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