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Which of the following is a natural number? $\newline$ Choices: $\newline$ (A) $\pi$ $\newline$ (B) $-2$ $\newline$ (C) $5$ $\newline$ (D) $\sqrt{7}$

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Find the focus or directrix of a parabola

Full solution

Q. Which of the following is a natural number?

\newline

Choices:

\newline

(A)

\pi

\newline

(B)

-2

\newline

(C)

5

\newline

(D)

\sqrt{7}

Definition of Natural Numbers: Natural numbers are the set of positive integers starting from $1$ . They do not include fractions, irrational numbers, or negative numbers. Let's evaluate each choice to see which one is a natural number.
Evaluate Choice (A): Choice (A) is $\pi$ (pi), which is an irrational number. It is not a natural number because it cannot be expressed as a positive integer.
Evaluate Choice (B): Choice (B) is $-2$ , which is a negative integer. Negative integers are not considered natural numbers.
Evaluate Choice (C): Choice (C) is $5$ , which is a positive integer. Positive integers are natural numbers.
Evaluate Choice (D): Choice (D) is the square root of $7$ ( $\sqrt{7}$ ), which is an irrational number. It is not a natural number because it cannot be expressed as a positive integer.

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