Let P={−2,−1,0,1,2}. A relation R on P is defined as
R={(a,b)∈P×P∣ab>0}.
Using this information, answer the following questions:
a. (i) List all ordered pairs in R.
b. (ii) Determine the domain and the range of R.
c. (iii) How many elements of P are not related to any other element under R? Give a reason for your answer.