If U=x:xisanaturalnumberlessthan20, then find its subsets Q such that
Q=oddnaturalnumbers
U=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
its subsets Q was given as Q=oddnaturalnumbers
therefore, Q=1,3,5,7,9,11,13,15,17,19
Universal Set: A set that consists of all elements of different sets under consideration is called the universal set. It is represented by U or ξ
If U=x:xisanaturalnumberlessthan20, then find its subsets P such that
P=evennaturalnumbers
If A represents the set of natural numbers less than 5, then find the number of elements in A.
Also, write the number of subsets.