Find the number of elements in only one set — task. Mathematics State Board, Class 9.

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$P$ ,

$Q$ 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

$R$

$1$

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7. Find the number of elements in only one set