The Total solution for NCERT class 6-12
Determine n if(i) 2nC3:nC3 = 12: 1(ii) 2nC3: nC3 = 11:1
Simplifying andcomputing
⇒ 4 × (2n – 1) =12 × (n – 2)
⇒ 8n – 4 = 12n –24
⇒ 12n – 8n = 24 –4
⇒ 4n = 20
∴ n = 5
⇒ 11n – 8n = 22 –4
⇒ 3n = 18
∴ n = 6