Answer : Given: 15Cr : 15Cr–1 = 11 : 5 To find: r=?
15Cr : 15Cr–1 = 11 : 5
⇒5×(16-r)=11r
⇒80-5r=11r
⇒16r=80
⇒r=5
Ans: r = 5
Answer : Given: 15Cr : 15Cr–1 = 11 : 5 To find: r=?
15Cr : 15Cr–1 = 11 : 5
⇒5×(16-r)=11r
⇒80-5r=11r
⇒16r=80
⇒r=5
Ans: r = 5