(7) letters से (4)-letter words बिना repetition बनाने की संख्या और \(^{7}C_4\) का संबंध क्या है?
What is the relation between the number of (4)-letter words from (7) letters without repetition and \(^{7}C_4\)?
Explanation opens after your attempt
A. यह \(^{7}C_4\times4!\) हैIt is \(^{7}C_4\times4!\)
Concept
First choose (4) letters and then arrange them in (4!) orders. In exams order is important in words.
Why this answer is correct
The correct answer is A. यह \(^{7}C_4\times4!\) है / It is \(^{7}C_4\times4!\). First choose (4) letters and then arrange them in (4!) orders. In exams order is important in words.
Exam Tip
पहले (4) letters चुनते हैं फिर उन्हें (4!) orders में रखते हैं। परीक्षा में words में order महत्वपूर्ण होता है।
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