A student can register for atmost n courses and each course

A student can register for atmost n courses and each course can have atmost m students,each student is enrolled to atleast one course and each course has atleast one student.The schema is normalised into three tables:

student,register ,courses

student table has X no. of tuples and course table has Y no. of tuples

​which one of the following options is correct?

a.Y=1

b.Y<=n*X

3.X>=m*Y

4.X<=10

2Comments
Vikash @vikasch
24 Dec 2014 12:07 am

option B is correct 
you can take some example and verify you will get this relation is correct for all values of     X, Y ,n and m

shreshtha @shreshtha
26 Dec 2014 12:28 pm

ohkk.. thank you :)