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Question
Show that the number 2 × 5 × 7 × 11 + 11 × 13 is a composite number.
Sum
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Solution
It can be observed that,
2 × 5 × 7 × 11 + 11 × 13
= 11 × (70 + 13)
= 11 × 83
Which is the product of two factors other than 1.
Therefore, it is a composite number.
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