1) A1 A2 be two events, show that P (A1 ∩ A2) ≤ P (A1) . P (A2)

2) show that P (A1 ∩ A2 ∩ ... ... An) ≤ P (A1) . P (A2) . ... ... ... ... P (An)

4)

show that P (A + B) + P (/ A + / B) = 1

I have problems with these exercises. I dont know if I copied them wrong.

thanks