यदि (8) digits में (0) शामिल है और repetition allowed नहीं है, तो (5)-digit numbers की count क्या होगी?
If (0) is included among (8) digits and repetition is not allowed, what is the count of (5)-digit numbers?
Explanation opens after your attempt
B. \(7\times{}^{7}P_4\)
Concept
There are (7) non-zero choices for the first place, and then (4) places are filled from the remaining (7) digits. In exams handle the first place separately.
Why this answer is correct
The correct answer is B. \(7\times{}^{7}P_4\). There are (7) non-zero choices for the first place, and then (4) places are filled from the remaining (7) digits. In exams handle the first place separately.
Exam Tip
पहले स्थान के लिए (7) non-zero choices हैं और फिर बाकी (4) स्थान (7) बची digits से भरते हैं। परीक्षा में पहले स्थान को अलग handle करें।
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