Maharashtra State BoardSSC (English Medium) 9th Standard
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If M is Any Set, Then Write M ∪ ϕ and M ∩ ϕ . - Algebra

One Line Answer

If M is any set, then write M ∪ `phi` and M ∩ `phi` .

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Solution

If M is any set, then

M ∪ `phi` = M 

and  M ∩ `phi` = `phi`

Concept: Number of Elements in a Set
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