Question

Express 728 as a product of its prime factors.

• A. $2^3\times 7\times 13$
• B. $2^2\times 7\times 13$
• C. $2^3\times 7^2\times 13$
• D. $2^2\times 7^2\times 13$

Answer 1

The correct option is A $2^3\times 7\times 13$

Given number is 728.
Prime factorisation of 728 is as follows:
$\begin{array}{cc}2& 728\\ 2& 364\\ 2& 182\\ 7& 91\\ & 13\end{array}$
Hence, $728=2\times 2\times 2\times 7\times 13$
$=2^3\times 7\times 13$