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Why is  it not lattice?

its a lattice.
Lattice : A poset (L , ≤) is a Lattice iff for all a , b ∈ L LUB(a,b) and GLB(a,b) both exist and  L

In made easy test series they have said it is not a lattice.
reason?
No reason has given.

A lattice must be first a poset i.e. it should be reflexive , anti-symmetric and transitive.

Here c   & b  so, it is not antisymmetric & hence not a lattice.

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Thank you

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+1 vote