probability

pl tell hw 2 do

Q .Let n be a positive integer and f(n) = 1! + 2! + 3! +........n! and R(x) and Q(x) be polynomials in x such that

f(n+2)= R(n)f(n+1) + Q(n)f(n) for all n≥1

Now let P(x) = - Q(x)/R(x) (for all x ≥ 1) denotes the probability of an arbitrary event. then P(1).P(2) is
a) 3/5
b) 1/2
c) 1/4
d) 2/5

thankx