With reference to Exercise 12, how many elements are there in the ring Q(Z 4 , {1,

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With reference to Exercise 12, how many elements are there in the ring Q(Z4 , {1, 3})?

Data from Exercise 12

Let R be a nonzero commutative ring, and let T be a nonempty subset of R closed under multiplication and containing neither 0 nor divisors of 0. Starting with R x T and otherwise exactly following the construction in this section, we can show that the ring R can be enlarged to a partial ring of quotients Q(R, T). Think about this for 15 minutes or so; look back over the construction and see why things still work. 

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