अक्षरों (P,Q,R,S,T,U) से बिना पुनरावृत्ति कितने (2)-अक्षरी कोड बनेंगे?
How many (2)-letter codes can be formed from (P,Q,R,S,T,U) without repetition?
Explanation opens after your attempt
B. (30)
Concept
\({}^{6}P_{2}=6\times5=30\) codes are possible. In a code, changing the position of letters changes the code.
Why this answer is correct
The correct answer is B. (30). \({}^{6}P_{2}=6\times5=30\) codes are possible. In a code, changing the position of letters changes the code.
Exam Tip
\({}^{6}P_{2}=6\times5=30\) कोड बनेंगे। कोड में अक्षर का स्थान बदलने से कोड बदलता है।
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