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The set contains 7 elements (Mon-Fri, Sat and Sun).
Every finite set containing "n" elements, has N = subsets, including the empty set and improper set.
In your case, n= 7 and N = = 128 subsets, including the empty set and improper set.
ANSWER. = 128 subsets, in all; and 128-1 = 127 proper subsets.
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Dear visitor SYL !
If I remember correctly, I just solved very similar problem (TWIN problem) for you with full explanation several days ago.
Isn't it so ?
I even referred to my lesson
- How many subsets are there in a given finite set of n elements?
in this site.
I did it with the only goal: to teach you.
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Hello again, SYL,
I got your message / (comment).
Glad to see your progress (!)
Come again to the forum soon to learn something new (!)