Search for: If n≤8 and nCr+1=20 and n−1Cr=10then n is equal to If n≤8 and nCr+1=20 and n−1Cr=10then n is equal to A5B6C7D8 Fill Out the Form for Expert Academic Guidance!l Grade ---Class 1Class 2Class 3Class 4Class 5Class 6Class 7Class 8Class 9Class 10Class 11Class 12 Target Exam JEENEETCBSE +91 Preferred time slot for the call ---9 am10 am11 am12 pm1 pm2 pm3 pm4 pm5 pm6 pm7 pm8pm9 pm10pm Please indicate your interest Live ClassesBooksTest SeriesSelf Learning Language ---EnglishHindiMarathiTamilTeluguMalayalam Are you a Sri Chaitanya student? NoYes Verify OTP Code (required) I agree to the terms and conditions and privacy policy. Solution: nCr+1 n−1Cr=2010⇒ n!(r+1)!(n−r−1)!r!(n−r−1)!(n−1)!=2⇒ nr+1=2This shows that n is even and r+1=n/2 Now. nCn/2=20 and n≤8⇒ n=6 Related content Raidas ke Pad Class 9 CBSE Class 11 English Core Writing and Grammar – Tenses Worksheet Top 10 Maths Project for Class 6 Class 10 Maths MCQs How to Download NTA NEET Admit Card 2024 Rashi And Nakshatra Quiz CBSE MCQ for Class 10 Science Genes – Definition, Structure, Diagram and its Types Octal to Binary Converter Km to cm Conversion