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Writing a Number as a Product of Its Primes

Which of the ...

Question

Which of the following is a prime number?

(a) 263
(b) 361
(c) 323
(d) 324

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Solution

(a) 263
263 = 1 × 263
The number 263 has only two factors, 1 and 263.
Hence, it is a prime number.

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