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a
A=x:1
b
B=x:x2−2=0 and x is rational
c
C=x:x is even prime number >2
d
D=x:x2=0 and x is integer
answer is D.
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Detailed Solution
1) A=ϕ because there are no natural numbers between 1 and 2.2) B=ϕ because x2=2 does not have rational solutions3) c=ϕ because there is only one even prime 2