a. True b. True c. False; a set can't belong to itself d. True e. True f. False; the only subsets of [tex]\{\varnothing,\{\varnothing\}\}[/tex] are [tex]\varnothing[/tex], [tex]\{\varnothing\}[/tex], and [tex]\{\varnothing,\{\varnothing\}\}[/tex] g. True