X is a random variable and 'a' and 'b' are constant show that `var(aX+b) = a^2 var(X)`.

If x is a random variable and a,b are constants, then Var (ax + b) = _______.

If for a random variable X, E(X) = 12 and Var (X) = 9 then find the value of E(2X+3) and Var (2X +3).

Answer as directed: if X and Y are two random variables, under what condition E(XY) = E(X).E(Y) ?

If a and b are the roots of the equation x^2+ax+b=0 ,then a+b=

If X and Y are two independent random variable, then E(XY) = ?

If a = x+y, b=x-y and c = x+2y , then show that a^3+b^3+c^3-3abc =7y^2(3x+2y)

If A = {2x : x is a natural number le6 } and B = {3x : x is a natural number le 5 } Prove that (B-A) uu B=B

If A = {2x : x is a natural number le6 } and B = {3x : x is a natural number le 5 } Prove that (A-B) nn B = O/

If A = {2x : x is a natural number le6 } and B = {3x : x is a natural number le 5 } Prove that (A-B) uu (B-A) = ( A uu B) - (A nn B)