(6) digits से (4)-digit numbers बिना repetition और first digit non-zero हो तो count किस expression से जुड़ी है यदि digits में (0) शामिल है?
If (4)-digit numbers are formed from (6) digits without repetition and the first digit is non-zero with (0) included, which expression gives the count?
Explanation opens after your attempt
A. \(5\times{}^{5}P_3\)
Concept
There are (5) non-zero choices for the first digit and then the remaining (3) places are filled from (5) remaining digits. In exams treat the first place as a separate case.
Why this answer is correct
The correct answer is A. \(5\times{}^{5}P_3\). There are (5) non-zero choices for the first digit and then the remaining (3) places are filled from (5) remaining digits. In exams treat the first place as a separate case.
Exam Tip
पहले digit के लिए (5) non-zero choices हैं और फिर बाकी (3) स्थान (5) remaining digits से भरते हैं। परीक्षा में पहला स्थान अलग case की तरह लें।
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