Josh Sizemore

2022-01-06

Let $A=\left\{1,2,\left\{3,4\right\}\right\}$. Which of the following are true and which false?
a. $1\in A$
b. $\left\{1\right\}\in A$
c. $3\in A$
d. $\left\{3\right\}\in A$
e. $\left\{3\right\}\subseteq A$

Heather Fulton

Expert

a. True (the element 1 is in set A)
b. False (the set which contains the element 1 isn't set A)
c. False (3 alone is not an element of set A)
d. False (The set containing only 3 is not an element of set A)
e. False (3 would have to be an element of set A to male this variant true)

deginasiba

Expert

1. T
2. F
3. F
4. F
5. F

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