10th Class Mathematics Real Numbers Question Bank Case Based (MCQs) - Real Numbers

According to Fundamental Theorem of Arithmetic, 20825 is a:

A) even number

B) prime number

C) neither prime nor composite

D) composite number

Correct Answer: D

Solution :

Sol. Every composite number can be uniquely expressed as a product of primes, except for the order in which these prime factors occur.

\[20825={{5}^{2}}\times {{7}^{2}}\times 17\]

\[\therefore \] 20825 is a composite number.

So, option [d] is correct.