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What is the difference between \(7!\div5!\) and (2!)?\(7!\div5!\) और (2!) का अंतर क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 4040
\(7!\div5!=\frac{7\times6\times5!}{5!}=7\times6=42\). Also, \(2!=2\times1=2\). Therefore, the required difference is \(42-2=40\). Option 42 is only the value of \(7!\div5!\), not the difference. Exam tip: In factorial division, cancel the common factorial term first to simplify the calculation.\(7!\div5!=\frac{7\times6\times5!}{5!}=7\times6=42\)। साथ ही, \(2!=2\times1=2\)। अतः दिया गया अंतर \(42-2=40\) है। विकल्प 42 केवल \(7!\div5!\) का मान है, अंतर नहीं। परीक्षा टिप: फैक्टोरियल के भाग में समान फैक्टोरियल पदों को पहले काटकर गणना आसान करें।
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