1. $A=\left\{x\in N|x=2k+1,x<50\right\}$

2. $B=\left\{x\in N|x=11k,x<100\right\}$

have similar intersts : có cùng sở thích 

have similar intersts : có cùng sở thích 

My family have 4 people. There are my mother,my father,my elder sister and me.My parents are both the same age, 50 years old.My father is a teacher ,he is very kind and hard-working. My morther is a nurse, she is interesting, I think she is the most funny person in my family. My elder sister is 18 years old, she is a student and she is very pretty,she not only learns well but also plays the piano very well, I think she will become a pianist in the future. And me, I’m 16 years old and I’m a pupil, in the future i'll be a marketing staff. I love my familly very much.For me, family always is the assured a reliable support.