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Explain why 7×11×13+13 and 7×6×5×4×3×2×1+5are composite …

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Explain why 7×11×13+13 and 7×6×5×4×3×2×1+5are composite no.

Posted by Isha Gupta 6 years, 8 months ago

CBSE > Class 10 > Mathematics

3 answers

Yogita Ingle 6 years, 8 months ago

<div>We have,
7×11×13+13 =13(7×11×1+1)
=13×78
=13×3×2×13
Hence, it is a composite number .
We have,
7×6×5×4×3×2×1+5 =5(7×6×4×3×2×1+1)
=5(1008+1)
=5×1009
Hence, it is a composite number .</div>

0Thank You

Prahalad Singh Darjawat 6 years, 8 months ago

7*11*13+13 Let's take common 13(7*11*1+1) *1 More then two factors then it is composite no. I HOPE YOU WILL DO SECOND QUESTION SELF

1Thank You

Isha Gupta 6 years, 8 months ago

Plz slove this

1Thank You

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CBSE > Class 10 > Mathematics