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" alue of "sum(r=0)^(40)r^(40)C(r)^(30)C...

" alue of "sum_(r=0)^(40)r^(40)C_(r)^(30)C_(r)" is "

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The value of sum_(r=0)^(40)rC(40,r)C(30,r)

The value of sum_(r=0)^(20)r(20-r)(^(20)C_(r))^(2) is equal to 400^(39)C_(20) b.400^(40)C_(19) c.400^(39)C_(19) d.400^(38)C_(20)

The value of sum_(r=0)^(3) ""^(8)C_(r)(""^(5)C_(r+1)-""^(4)C_(r)) is "_____" .

The value of sum_(r=0)^(3) ""^(8)C_(r)(""^(5)C_(r+1)-""^(4)C_(r)) is "_____" .

The value of sum_(r=0)^(3)""^(8)C_(r)(""^(5)C_(r+1)-""^(4)C_(r)) equals ________

The value of sum_(r=0)^(3) ""^(8)C_(r)(""^(5)C_(r+1)-""^(4)C_(r)) is "_____" .

The value of sum_(r=0)^(20)r(20-r) (.^(20) C_r)^2 is equal to a. 400^(39)C_(20) b. 400^(40)C_(19) c. 400^(39)C_(19) d. 400^(38)C_(20)

The value of sum_(r=0)^(20)r(20-r) (.^(20) C_r)^2 is equal to a. 400^(39)C_(20) b. 400^(40)C_(19) c. 400^(39)C_(19) d. 400^(38)C_(20)

The value of sum_(r=0)^(20)r(20-r)(^(20)C_r)^2 is equal to 400^(39)C_(20) b. 400^(40)C_(19) c. 400^(39)C_(19) d. 400^(38)C_(20)