068-2015

MO640 - Multiple-choice question

Call T(U) the collection of the trivial subsets of U.
The complete collection of C = {bfg, cdef, abcd} under U = abcdefg is:

a) T(U) ∪ {ab, abcd, abcdef, abcdfg, acd, bcdefg, bfg, bg, cd, cde, cdef, ef, fg}
b) T(U) ∪ {ab, abcdef, abcdfg, bcdefg, bdfg, bg, cd, cde, cdef, ef, efg, fg}
c) T(U) ∪ {abcd, abcdef, abcdfg, acd, bcdfeg, bfg, cde, cdef}
d) T(U) ∪ {abcdef, abcdfg, bcdfeg}
e) None of the above

Original idea by: Miriam Ito