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Is 7 × 5 × 3 × 2 + 3 a composite number? Justify your answer.

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Is 7 × 5 × 3 × 2 + 3 a composite number? Justify your answer.

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Best answer

Given: 

7 × 5 × 3 × 2 + 3 

= 3 (7 × 5 × 2 + 1) 

= 3 × (70 + 1) 

= 3 × 71 

∴ The given number has two factors namely 3 and 71. 

Hence it is a composite number.

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