8.. if you count the empty subset
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13/12 is not a whole number and so you cannot write it as a whole number.
It is (12 + 13)/2 = 25/2 = 12.5 or 12½
The lowest common multiple of 12 and 13 is 156
13 - 12 = 12
There are an infinite number of numbers between 12 and 13. decimals, fractions and irrational numbers