Question

if B={x/x is prime} and C={x/x is composite}, which is A union B?

Answer 1

Answer:

A U B = {x/x is a natural number greater than 1}

Answer 2

Given,

$\[\begin{array}{l}A = \left\{ {x/x\,is\,prime} \right\}\\B = \left\{ {x/x\,is\,composite} \right\}\end{array}\]$

Solution,

Calculate $\[A \cup B\]$

A prime number is a number greater than 1 with only two factors 1 and number itself.

A number that is divisible by a number other than 1 and the number itself, is called a composite number.

$\[\begin{array}{l}A = \left\{ {2,3,5,7,11,13,17,19, - - - } \right\}\\B = \left\{ {4,6,8,9,10,12,14,15,16 - - - } \right\}\end{array}\]$

$\[A \cup B = \left\{ {2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 - - - } \right\}\]$