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Question

(18 x 25 x 25 + 25) gives a ___ number.


A

Composite

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B

Neither Prime nor composite

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C

Prime and composite

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D

Prime

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Solution

The correct option is A

Composite


18x25x25 + 25 = 25(450 + 1)
= 25 x 451
which is composite since it has 2 factors other than one.


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