7. Find the number of elements in only one set

If \(P\), \(Q\) and \(R\) are three sets such that \(P\) has 30 elements, \(Q\) has 27 elements, \(R\) has 29 elements, \(P \cap Q\) has 18 elements, \(Q \cap R\) has 15 elements, \(P \cap R\) has 15 elements and \(P \cap Q \cap R\) has 11 elements, then find number of elements only in set \(P\), and only in set \(R\)?

 

1. Number of elements only in set \(P\)

 

2. Number of elements only in set \(R\)