X follows the poisson distribution and `P(X=1)=P(X=2)`, find P(X=4).

X follows theh poisson distribution and P(X=1) = P(X=2), find P(x = 4).

The mean of the following frequency distribution is 53,find the value of p.

If X~B(n,p) , then find Var(X).

If X=Φ then n(P(X))=?.

For what value of p, the following system of linear equation has infintely many solution. (p-1)x-y=5, (p+1)x+(1-p)y=3p+1

If A and B are two events not mutally exclusive and P(A) = 1/4, P(B) = 2/5, P(AuuB) = 1/2 Find P(A/B)

Find the domain of the following functions given by f(x)=(x^2+2x+1)/(x^2-4) .

Find the roots of the following equations: (5x-6)/(4x-1)=(2x+3)/(3x+2)

For a inomial distribution mean is 3 and variance is 2. Find the values of n and p.