The expression C(20,0).C(20,1)+C(20,1).C...

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}.

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

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

1.^(20)C_(1)-2.^(20)C_(2)+3.^(20)C_(3)-...-20.^(20)C_(20)

20 C_(0)+20 C_(1)+20 C_(2)+.. .+20 C_(10) =

The sum of series ^(20)C_0-^(20)C1+^(20)C2-^(20)C3++^(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 sum ""^(20)C_(0)+""^(20)C_(1)+""^(20)C_(2)+……+""^(20)C_(10) is equal to :

If ""^(20)C_(r)=""^(20)C_(r-10) , then ""^(18)C_(r) is equal to

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