Which of the following is true of iambic pentameter?
a. it has 14 syllables per line.
b. it is divided into a pair of fives.
c. it has a stressed syllable followed by an unstressed syllable.
d. it is present in both italian sonnets and shakespearean sonnets.

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?