Twelve school photographs (all the same size) are placed in random order face down on a table. Two of them are of identical twin boys. One of the twins is brought into the room and asked to select a photograph.

a. What is the probability that he will select his own by chance?

b. What is the probability that he will select his own or his brother's?

c. If he is asked to select 2 photographs, what is the probability that he will select his own and his brother's?