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Question


What is the product of the successor and predecessor of the largest 2 digit number?


Options:
A .   198
B .   9800
C .   199
D .   9900
Answer: Option B
:
B

The largest 2 digit number = 99


To find the successor of a number, we add 1 to it. 


99 + 1 = 100
The successor of 99 = 100


To find the predecessor of a number we subtract 1 from the given number.


99 - 1 = 98 
Predecessor of 99 = 98
Product = 98×100=9800



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