Question

What is wrong with the set listed below?

D = { m , a , t , h , e , m , a , t }

Answer 1

You cannot write same elements in a set.

Explanation:

In Set Theory, you cannot write same elements in a set.

Examples

A = {1,1} is not correct; the correct is A = {1}

B = {a,a,b,b,c,c} is not correct; the correct is B = {a,b,c}

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See for D = {m,a,t,h,e,m,a,t}

There are same m's, a's and t's.

The correct should be D = {m,a,t,h,e}