One fourth of 8 is 2.
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9
These are perfect cubes (of 1, 2 and 3) so the next two are 64 and 125
3 Because the numbers 7 8 9 form a different series Think of it without those and you get : 6 5 4 3
64
8 is not an irrational number because it can be expressed as a fraction in the form of 8/1 and so therefore it is a rational number