Question

The product of predecessor and successor of $99$ is:

• A. $9,702$
• B. $9,800$
• C. $9,900$
• D. $9,988$

Answer 1

The correct option is B

$9,800$

Explanation for the correct option:

Given number is $99$;

The successor of $99$ is $100$;

The predecessor of $99$ is $98$;

Hence product of successor and predecessor of $99$

$$\begin{gathered} =98\times 100 \\ =9,800 \end{gathered}$$

Hence, the correct answer is option(B).