How can we tell that a number has 2 and 5 as its prime factor?
Answer (1)
20th Jan, 2023
Any number which has 0 in its ones place will have 2 and 5 as its prime factors. Let's take 21500 as an example.
\begin{aligned}
&\21500 = 2150 \times 10\\
&= 2150 \times 2 \times 5
\end{aligned}
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