Question

plz guys 12 and 13 fast ​

Answer 1

12. Null set Does not contain any element..So any set which is a subset of Null set is itself a null set..So A is also a null set

13. Let A is 1 2

B is 1 2 3

C is 1 2 3 4

Still A is a subset of C...

hence,proved

Answer 2

13.h hence proved .