Question

The total population of a city is written in scientific notation as $a\times b^5,$ where a is a whole number. Which of these can be the maximum population of the town?

• A. $900,000$
• B. $999,999$
• C. $\text{Cannot say}$
• D. $1,000,000$

Answer 1

The correct option is A $900,000$

Detailed step-by-step solution:
The population of the city, $P=a\times b^5$

$\because a\times b^5$ is in scientific notation.
$\because 1\le a<10,\text{and}b=10$

The maximum value of $a$ will be $9$ , where a is a whole number.
So, the maximum population of city, $P=9\times {10}^5$

$\Rightarrow P=900,000$

➡ Option C is correct.