If A=

If A= SOLUTION Choice u estions: IfJA {5, {5, 6}, 7}, which of the ? X {a, {b, c}, d}, which of the

The option B) {5,6,} is correct because it is a set belongs to {5,{5,6},7}. The sets {5} and {6} are not belongs to {5,{5,6},7} because they are elements.