A = {1, 2, 3, 4} true or not(iii) A ⊂ {1, 2, 3, 4
Answers
Answered by
20
Answer:
IF EXAMPLE TAKE
A = {1,2,3}
B={1,2,3,4}
now, all the elements of A are in B
therefore, A ⊂ B
Step-by-step explanation:
NOW OURS
A={1, 2, 3, 4}
IT IS TRUE
A⊂{1, 2, 3, 4}
SO ALL ELEMENTS OF A IS ⊂ of the numbers
MY OWN SUM DID PROMISE
Answered by
2
When selecting elements of a set to include in a subset, each element of the set is either in or not in the subset. Two possibilities for each element.
So the number of possible subsets of A is 2 × 2 × 2 × 2 = 2^4 = 16.
But one of these is the improper subset of A.
Another of these subsets is the empty set.
So the number of non-empty, proper subsets of A is 16 - 2 = 14.
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