Suppose that the universal set `U` is the set defined as `U=\{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10\}`.

Write the sets `A` and `B` out in roster notation.

`A=\{ x \in U |` x is an even number `\} = \{` `\}`

`B=\{ x \in U |` x is a prime number ` \} = \{` `\}`



Find each of the following:

`n(A)=`

`n(B)=`

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