Behna factorization easy ha but practice is compulsory ....As practice makes the man perfect but agr in sir ne nai bnai video to ap sir Waqas Nasir se smjlo
Book pay answer ghalat ha Empty set ka jis set kay sath union lain wohi set anwer ata ha x empty set ha is ka jub set Y kay sath union lain gay to Y hi answer ho ga