Properties of C -n,r


 
 
Concept Explanation
 

Properties of Combination Formula

 1.;;^nC_r=^nC_{n-r}

 2.;;^nC_o=^nC_n=,^nC_1=n

 3.;;If ^nC_x=^nC_y then either x= y  or  y=n - x i.e.,x+y=n=,^nC_1=n

 4.;;^nC_r+^nC_{r-1}=^n^+1C_r

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