15. Suppose we want to generate randomly 8 bits, with O or 1 in cach bit. Let E1, be the eventof bit O being 1, Ez be the event of bit 7 being 0, and Es be the event of both bits 3 and4 being 1. Which of the following are true?
(A) The probability P(E1| E2)=
(B) Theprobability P(E1| E2) =
(C) The probability P(E1| E2, E3)=
(D) The probabilityPE2| E1, E3)=