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2, 3, 5, 7, ... The set of prime numbers is the alphabet of mathematics that allows us to communicate across the universe.

What is the next prime number in this sequence:

\[2, 3, 5, 7, 11, 13, \underline{\quad}, \ldots ? \]

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True or false: the number \( 47 \) is prime.

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Which of the following numbers is prime?

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\[A, \hspace{0.5cm} A+2, \hspace{0.5cm} A+4\]

If \(A>3,\) can all three numbers above be prime?

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True or false: the number \( 21 \) is prime.

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