Question

Urgent help needed! Question:

A{1,2}, B {2,1} and C{1,2,3}

Why is A a subset of B, but A is not a proper subset of B?

Answer 1

do you mean "but A is not a proper subset of C"??

Answer 2

nope I meant A is not a proper subset of B. That's the eg stated in my book...so the book's wrong?

Answer 3

i am just asking to be sure...

Answer 4

Let A={a,b,c} and B={b,a,c}. As u can see the all the elements in B are also in A. So B is a subset of A. Set B contains the exact number of elements that A contains. If it is so then B is not a proper set. For it to be a proper set of A, all the elements in it also should be in A but it shoud not contain the exact number of elements as A. Does that help? @WildSparks

Answer 5

@ajprincess I get it now. Thank you!!!(:

Answer 6

Welcome:)