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If (^{n}C_{5}:^{n}C_{4}=7:2), what is the value of (n)?यदि (^{n}C_{5}:^{n}C_{4}=7:2) है, तो (n) का मान क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (21)(21)
(\frac{^{n}C_{5}}{^{n}C_{4}}=\frac{n-4}{5}=\frac{7}{2}) gives no integer (n). Always check validity of the ratio.(\frac{^{n}C_{5}}{^{n}C_{4}}=\frac{n-4}{5}=\frac{7}{2}) से (n=21.5) नहीं आता, इसलिए सही अनुपात जांचना जरूरी है। यहां कोई पूर्णांक (n) संभव नहीं है।
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