Question

The product of successor and predecessor of 999 is ____.

• A. 999000
• B. 998000
• C. 989000
• D. 1998

Answer 1

The correct option is B 998000

We know that, the successor of a whole number is the number obtained by adding 1 to it and the predecessor of a whole number is one less than the given number.
So, the successor of 999 = 999 + 1 = 1000
and the predecessor of 999 = 999 - 1 = 998
$\therefore$ The product of successor and predecessor of 999
= $1000\times 998$
= $998000$

Hence option B is correct.