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Statistics — Maths STD 10 — Question

Gujarat BoardEnglish MediumSTD 10MathsStatistics4 Marks
Question
Explain why $3 × 5 × 7 + 7$ is a composite number.
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Answer

We have, $3 × 5 × 7 + 7 = 105 + 7 = 112$
Now, $112 = 2 × 2 × 2 × 2 × 7 = 2^4× 7$
So, it is the product of prime factors $2$ and $7$. i.e., it has more than two factors.
Hence, it is a composite number.

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