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

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

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

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

The value of sum_(r=0)^(40) r""^(40)C_(r)""^(30)C_(r) is (a) 40.^(69)C_(29) (b) 40.^(70)C_(30) (c) .^(60)C_(29) (d) .^(70)C_(30)

The value of sum_(r=0)^(40) r""^(40)C_(r)""^(30)C_(r) is (a) 40.^(69)C_(29) (b) 40.^(70)C_(30) (c) .^(60)C_(29) (d) .^(70)C_(30)

The value of sum_(r=0)^(10)r(C(n,r))/(C(n,r-1))=

The value of sum_(r=0)^(20)r(20-r)( ^(20)C_r)^2 is equal to ?

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)^(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)