The sum of the series `C(20,0)-C(20,1)+C(20,2)-C(20,3)+...-...+C(20,10)` is

C(20,0)+C(20,1)+C(20,2)+...+C(20,10)

The sum of the series 20C_(0)-^(20)C_(1)+^(20)C_(2)-^(20)C_(3)+...-...+^(20)C_(10) is:

The sum of the series S=20C_(0)-20C_(1)+20C_(2)-20C_(3)+...+20C_(10) is

The sum of the series 20C_(0)-20C_(1)+20C_(2)-20C_(3)+...+20C_(10) is

The sum of the series .^(20)C_(0)-.^(20)C_(1)+ .^(20)C_(2)-.^(20)C_(3)+...-.+ .^(20)C_(10) is -

The sum of the series .^(20)C_(0)-.^(20)C_(1)+ .^(20)C_(2)-.^(20)C_(3)+...-.+ .^(20)C_(10) is -

The sum of series .^(20)C_0-^(20)C_1+^(20)C_2-^(20)C_3+....+^(20)C _10 is

The expression C(20,0).C(20,1)+C(20,1).C(20,2)+...+C(20,19).C(20,20) equals C(n,r), where r>[n/2].The value of r is ..............{where [ ] is the step function}.