Induction 2

Probability Level pending

How many subsets X ∈ Z X \in \mathbb{Z} satisfy the harder (than this ) set equation

X = X + 2 X=X+2 ?

Note: The set equation means that ∀ x ∈ X , x + 2 ∈ X \forall \space x \in X, x+2 \in X

General case .

0 2 3 4 1

Wen Z by Wen Z , 20, Australia

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