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Find A∪ B a...

Question

Find $A \cup B$ and $A \cap B$ when:
$A$ is the set of all prime numbers and $B$ is the set of all composite natural numbers

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Solution

$A = {2, 3, 5, 7, 11, . . . . . .}$
$B = {4, 6, 8, 9, 10, 12, 14, . . . . . . .}$
$A \cup B = {2, 3, 4, 5, 6, 7, 8, 9, 10.....}$
$A \cap B = ϕ$

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A

B

are two sets such that

A

= Set of all prime numbers and

B

= Set of all even natural numbers,
then find

A \cap B .

A \cup B

A \cap B

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is the set of all positive real numbers and

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Q. Check whether the sets

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B

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is the set of all even positive integers,

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Q. The set A and set B are defined as

A = {x : x i s a n a t u r a l n u m b e r}

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The union of set A and set B is a set of all .

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B = {all odd natural number}

then, a and b are which type of sets ?

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