1.

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

Answer»

We know that,

A number that is divisible by a number other than 1 and itself, is called a composite number. 

Now,

7 × 5 × 3 × 2 + 3 = 3(7 × 5 × 2 + 1) 

= 3(70 + 1) 

= 3 × 71. 

∵ The given number has two factors 3 and 71 other than 1 and itself. 

∴ The given number is a composite number.



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