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[sum(r=1)^(30)r(30)/(30)C(r-1),=],[[" (a...

[sum_(r=1)^(30)r(30)/(30)C_(r-1),=],[[" (a) "930," (b) "465],[" (c) "310," (d) "630]]

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[" If "^(n+1)C_(r+1):^(n)C_(r):^(n-1)C_(r-1)=11:6" : "],[" 3,then "nr=],[[" (A) "20],[" (B) "30],[" (C) "40],[" (D) "50]]

sum_(r=1)^(30) r (""^(30)C_(r))/(""^(30)C_(r-1))= ___________

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)^(40) r""^(40)C_(r)""^(30)C_(r) is

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

If sum_(r=1)^(oo) (C^r)/(r!) =1 then C =