Question

{a,b,c}

✴for this set it is true to say
a ∈ {a,b,c}

✴But, Ø ∉ {a,b,c} ...(2)

in fact {Ø} ∈ {a,b,c }

✴Then , explain why 2 number not happen???

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Answer 1

...HERE IS YOUR ANSWER...
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It happened because... in (2), Φ is not in closed brackets.. So, Φ is not an element of {a,b,c}
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Answer 2

HERE IS YOURS ANSWER;

According to yours question;

◆ The value of {a,b,c} must have a real value or real & unequal value.

◆ {a,b,c} is neither can have null set nor a complex number value.

◆ So, we can concluded that it can have a real value but cannot have 2 numbers.

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