Let $R = \{(x,y) : x,y \in N \text{ and } x^2 - 4xy + 3y^2 = 0\}$,where $N$ is the set of all natural numbers. Then the relation $R$ is

  • A
    reflexive but neither symmetric nor transitive
  • B
    symmetric and transitive
  • C
    reflexive and symmetric
  • D
    reflexive and transitive

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The relation "is subset of" on the power set $P(A)$ of a set $A$ is

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