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Prime Factor Method for L.C.M

Which one of ...

Question

Which one of the following is a prime number?

A

184

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B

171

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C

173

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D

221

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Solution

The correct option is D $173$
$184 = 23 \times 8$
Therefore, cannot be prime
$171 = 19 \times 9$
Therefore,cannot be prime
$221 = 17 \times 13$
Therefore, cannot be prime
Hence, by elimination we have $173$ as a prime number.

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