यदि (7) digits में (0) शामिल है और repetition allowed है तो (4)-digit numbers की count क्या होगी?
If (0) is included among (7) digits and repetition is allowed, what is the count of (4)-digit numbers?
Explanation opens after your attempt
A. \(6\times7^3\)
Concept
The first digit cannot be (0), so there are (6) choices and (7) choices for each remaining place. In exams treat leading zero separately.
Why this answer is correct
The correct answer is A. \(6\times7^3\). The first digit cannot be (0), so there are (6) choices and (7) choices for each remaining place. In exams treat leading zero separately.
Exam Tip
पहला digit (0) नहीं हो सकता इसलिए (6) choices हैं और बाकी तीन स्थानों पर (7) choices हैं। परीक्षा में leading zero को अलग देखें।
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