Question

The product of the predecessor and the successor of the greatest $2-$digit number is

• A. $9900$
• B. $9800$
• C. $9700$
• D. none of these

Answer 1

The correct option is B

$9800$

Greatest $2-$digit number is $99$.

Predecessor of the greatest $2-$digit number is $99-1=98$ .

Successor of the greatest $2-$digit number is $99+1=100$.

The product of the predecessor and the successor of the greatest $2-$digit number is $98\times 100=9800$.

Hence , option B is correct.