Home
Class 11
MATHS
The value of sum(r=0)^(20)r(20-r)(.^(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)`

Promotional Banner

Similar Questions

Explore conceptually related problems

sum_(r=0)^(20).^(50-r)C_6

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

sum_(k=0)^(20)(.^(20)C_(k))^(2) is equal to

the value of 40c_(31)+sum_(r=0)^(10)(C_(10+r)^(40-r)) is equal to

The value of sum_(r=0)^(9)(10C_(r))/(^^^10C_(r)+^(10)C_(r+1)) is equal to

The value of sum_(r=0)^(15)r^(2)((""^(15)C_(r))/(""^(15)C_(r-1))) is equal to

The value of sum_(r=0)^(10)(r)^(20)C_(r) is equal to 20(2^(18)+^(19)C_(10)) b.10(2^(18)+^(19)C_(10)) c.20(2^(18)+^(19)C_(11)) d.10(2^(18)+^(19)C_(11))