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19.
d) sometimes rational and sometimes irrational
20.
a) the sum of two rational number is always irrational
21)
d) π is irrational and 22/7 is rational
22)
a) (√2+√3)/2
23)
d) 0.853853853..
24)
a) irrational number
25)
b)2/9
26)
c)5/3
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