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
Correct Answer

C. (27)

Step 1

Concept

Each place has (3) choices, so \(3^3=27\). When repetition is allowed, choices do not decrease.

Step 2

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.

Step 3

Exam Tip

हर स्थान पर (3) विकल्प हैं इसलिए \(3^3=27\)। repetition allowed हो तो विकल्प कम नहीं होते।

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Mathematics Answer, Explanation and Revision Hints

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?

Correct Answer: C. (27). Explanation: हर स्थान पर (3) विकल्प हैं इसलिए \(3^3=27\)। repetition allowed हो तो विकल्प कम नहीं होते। / Each place has (3) choices, so \(3^3=27\). When repetition is allowed, choices do not decrease.

Which concept should I revise for this Mathematics MCQ?

Each place has (3) choices, so \(3^3=27\). When repetition is allowed, choices do not decrease.

What exam hint can help solve this Mathematics question?

हर स्थान पर (3) विकल्प हैं इसलिए \(3^3=27\)। repetition allowed हो तो विकल्प कम नहीं होते।