Question 1038680
Likely? Each subset is as likely as any other.
{a} {b} {c} {d}
{a,b} {a,c} {a,d} {b,c} {b,d} {c,d}
{a,b,c} {a,b,d} {a,c,d} {b,c,d}
{a,b,c,d} 
Empty Set