यदि 4× nC= 9 × n-1C5 है तो n का मान क्या होगा?

  1. 7
  2. 10
  3. 9
  4. 5

Answer (Detailed Solution Below)

Option 3 : 9
Free
HTET PGT Official Computer Science Paper - 2019
60 Qs. 60 Marks 60 Mins

Detailed Solution

Download Solution PDF

प्रयुक्त सूत्र:

n! = n × (n - 1) × (n - 2).......3 × 2 × 1 

गणना:

दिया गया है कि,

4 × nC= 9 × n-1C5

उपरोक्त सूत्र का प्रयोग करने पर 

⇒ 

⇒ 

⇒ 9n - 45 = 49

⇒ 5n = 4n

n = 9

Latest HTET TGT Updates

Last updated on Jul 12, 2025

-> HTET Exam Date is out. HTET Level 1 and 2 Exam will be conducted on 31st July 2025 and Level 3 on 30 July

-> Candidates with a bachelor's degree and B.Ed. or equivalent qualification can apply for this recruitment.

-> The validity duration of certificates pertaining to passing Haryana TET has been extended for a lifetime.

-> Enhance your exam preparation with the HTET Previous Year Papers.

Hot Links: lucky teen patti teen patti real money app teen patti noble teen patti gold apk