If (10)9+2(11)1(10)8+3(11)2(10)7+...+10(11)9=k(10)9, then k is equal to :
If (10)9+2(11)1(10)8+3(11)2(10)7+...+10(11)9=k(10)9, then k is equals to: (IIT JEE Main 2014)