Question
Download Solution PDFयदि 4× nC5 = 9 × n-1C5 है तो n का मान क्या होगा?
Answer (Detailed Solution Below)
Option 3 : 9
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HTET PGT Official Computer Science Paper - 2019
60 Qs.
60 Marks
60 Mins
Detailed Solution
Download Solution PDFप्रयुक्त सूत्र:
n! = n × (n - 1) × (n - 2).......3 × 2 × 1
गणना:
दिया गया है कि,
4 × nC5 = 9 × n-1C5
उपरोक्त सूत्र का प्रयोग करने पर
⇒
⇒
⇒ 9n - 45 = 49
⇒ 5n = 4n
⇒ n = 9
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