Determine whether the sets below are well-defined or not. For each well-defined set, state whether it is finite or infinite.
a) The set of women pregnant with twins at some time during this year.
b) The set of kangaroos in Australia.
c) The set of tall buildings.
d) The set of grains of sand on the earth.
e) The set of even integers.
f) The set of hairs on your head.
g) The collection of all subsets of the set of hairs on your head.
h) The set of people who shook hands with George Washington.

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a. finite
b. finite
c. finite
d. finite
e. infinite
f. finite
g. finite
h. finite

It asked are they well-defined and I am not sure how to tell if they are well-defined.

What's well defined mean?

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