Numbers like $1, 4, 9, 16, 25$ are:

perfect squares

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non perfect squares

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prime

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composite

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Solution

The correct option is D perfect squares
$1 \times 1 = 1$
$2 \times 2 = 4$
$3 \times 3 = 9$
$4 \times 4 = 16$
$5 \times 5 = 25$
All are square numbers, so they are perfect squares.
Therefore, A is the correct answer.

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Numbers like 1, 4, 9, 16, 25, ... are known as ________.

The Roster form of the set A = ${x : x i s a p e r f e c t s q u a r e, x \in N, x \leq 30}$ is ________.

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