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) + …. =k ( 10)^(9) , then k is equal to

If (10)^9+2(11)^1(10)^8 +….+10 (11)^9 = k(10)^9

If (10)^9+2(11)^2(10)^7 +….+10 (11)^9 = k(10)^9

if 10^(9)+2*11^(1)*10^(8)+3*11^(2)*10^(7)+............+10*11^(9)=k*10^(9) then k equals to:

If 2^(10) + 2^(9) * 3^(1) + 2 ^(8) * 3^(2) + …. + 2 * 3^(9) + 3^(10) = S - 2^(11) , then S is equal to :

The value of (10^(11)-10^(9)-2xx11*10^(8)-3xx11^(2)xx10^(7)-....-(10)xx11^(9)) is equal to

Sum of 10^(9)+11.10^(8)+2.11^(2)+10^(7)+3.17^(8.10)-4+......+11^(9)

2^(10)+2^(9) .3^1+.....2.3^9+3^(10)=A-2^(11) . Find A=

(9)/(10)+(3)/(11)+(7)/(15)=?

If |(""^(9)C_(4),""^(9)C_(5),""^(10)C_r),(""^(10)C_(6),""^(10)C_(7),""^(11)C_(r+2)),(""^(11)C_(8),""^(11)C_(9),""^(12)C_(r+4))|=0 , then the value of r is equal to a)3 b)4 c)5 d)6