" - 21.Eroaluat "20C_(5)+sum_(x=2)^(5)25hat C_(4)

Evaluate .^(20)C_(5)+sum_(r=2)^(5).^(25-r)C_(4)

Evaluate : .^(20)C_(5)+sum_(j=2)^(5).^(25-j)C_(4)

Evaluate: .^(20)C_(5)+^(20)C_(4)+^(21)C_(4)+^(22)C_(4)

Evaluate: .^(20)C_(5)+^(20)C_(4)+^(21)C_(4)+^(22)C_(4)

Prove that .^(35)C_(5) + sum_(r=0)^(4^((39-r))) C_(4) = .^(40)C_(5)

The sum C(21,6)+sum_(r=0)^(5)C(21+r,5) equal C(n,6). The value of n is (a) 26 (b) 28 (c) 29 (d) 27

What is ""^(47)C_(4)+""^(51)C_(3)+ sum_(j=2)^(5) ""^(52-j)C_(3) equal to ?

The volume of a given mass of gas at 273K is x ? The volume of it at 20^(0)C is V_(20) .Then its volume at 25^(0)C is (1) 25x (2) V_(20) +(25x)/(273) (3) V_(20) +(5x)/(273) (4) V_(20) X5x