The product of successor and predecessor of 999 is
A) 999000
B) 998000
C) 989000
D) 1998

Hint: We will find the successor and predecessor of the given number then we will find the product of the number. The successor is the very next whole number of the given number and the predecessor is the one whole number before the given number.

Complete step-by-step answer:
Here we are asked to find the product of the successor and predecessor of 999. So at first, we will find the successor and predecessor of the given number .then after we will multiply both the numbers with each other respectively to get the final answer. So, let’s find the successor of the number 999. The successor of a number means the very next whole number of the given number. So we will add one to the given number to find the successor of the given number. We have 999 as the given number so by adding 1 we will get the successor of the given number respectively. So $ 999 + 1 = 1000 $ is the successor of the number 999.
Similarly, we will find the predecessor of the given number 999. So the predecessor of a number means the whole number before the given number. So we have been given 999 as the number so the predecessor of 999 will be one whole number subtracted from the given number. Hence we will subtract 1 from 999 to get the predecessor of the number 999. Which is equal to $ 999 - 1 = 998 $ .
So now we will multiply both the numbers. So $ 998 \times 1000 $ will be the answer.
So $ 998 \times 1000 = 998000 $ as the final answer to the given problem. Hence option c is the correct answer.
So, the correct answer is “998000”.

Note: : Usually we get confused while calculating the predecessor and successor of a number like we interchange both the numbers so we should take care of this thing while calculating these numbers.