Find the values of
P(20,2)

Find the value of (20!)/(18! (20 - 18)!)

Let p(x) be a polynomial of degree 4 having extremum at x = 1,2 and lim_(x->0)(1+(p(x))/x^2)=2. Then find the value of p(2).

If sin theta+cosec theta=2 , then find the value of sin^(20)theta+cosec^(20)theta .

Find the value of r, if (i) .^(11)P_(r)=990 (ii) .^(8)P_(5)+5*^(8)P_(4)=^(9)P_(r)

Find the value of p if (2hati+6hatj+27hatk)xx(hati+3hatj+phatk)=vec0 .

A random variable X has poisson's distribution with mean 3. Then find the value of P(Xgt2.5) .

3,x,9 are in A.P . Find the value of x

Find the value of 11^2 + 12^2 + ..... + 20^2

If P(A)=2/5 and P(B)=1/3 , A and B are independent events, then find the value of P(AnnB) .