Question

C = {x : x is a square number less than 20}.
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Answer 1

Answer:

According to the condition.

Step-by-step explanation:

C = 1,4,9,16

These numbers are perfect squares and less than 20

Answer 2

Complete Question: Write the elements of the set C = {x : x is a square number less than 20}.

Answer:

The required answer is $C=\{1,4,9,16\}$.

Step-by-step explanation:

Roaster form: The elements are listed inside the curly brackets and separated by the symbol comma, which is termed as roaster form.

Consider the given set as follows:

$C=$ {$x:x$ is a square number less than $20$}

The square of the number $1$ is,

$1^2=1$

⇒ $1 < 20$

Thus, $1$ belongs to the set $C$.

The square of the number $2$ is,

$2^2=4$

⇒ $4 < 20$

Thus, $4$ belongs to the set $C$.

The square of the number $3$ is,

$3^2=9$

⇒ $9 < 20$

Thus, $9$ belongs to the set $C$.

The square of the number $4$ is,

$4^2=16$

⇒ $1 6 < 20$

Thus, $4$ belongs to the set $C$.

The square of the number $5$ is,

$5^2=25$

⇒ $25 \nless 20$

Thus, $5$ does not belong to set $C$.

Therefore, the elements of the set $C$ are,

$C=\{1,4,9,16\}$

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