Whole numbers = 0, 1, 2, 3, …
If we take x = 0 then x + 3 = 0 + 3 = 3
If we take x = 1 then x + 3 = 1 + 3 = 4 > 3
So, 0 is the element of set E because it satisfies the given equation.
∴ It is not a null set.
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