अंकों (1,5,9) से पुनरावृत्ति की अनुमति होने पर कितनी (3)-अंकीय संख्याएँ बनेंगी?
How many (3)-digit numbers can be formed from digits (1,5,9) if repetition is allowed?
Explanation opens after your attempt
C. (27)
Concept
Each place has (3) choices, so \(3^3=27\). When repetition is allowed, choices do not decrease.
Why this answer is correct
The correct answer is C. (27). Each place has (3) choices, so \(3^3=27\). When repetition is allowed, choices do not decrease.
Exam Tip
हर स्थान पर (3) विकल्प हैं इसलिए \(3^3=27\)। repetition allowed हो तो विकल्प कम नहीं होते।
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