\f3.6. Prove that if E1, E2, ..., En are independent events, then n P(E1 UE2 U .. . UEn) = 1- II [1 - P(E.)] i = 13.11. In each of n independent tosses of a coin, the coin lands on heads with probability p. How large need n be so that the probability of obtaining at least 1 one head is at least 5 ? \f