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**Hint:**We have to find the value of the predecessor of the smallest three digit number . We solve this question using the general knowledge of the smallest three digit number and the knowledge of the definition of the predecessor and successors of the numbers and the formula for calculating the predecessor of a number . First we will find the smallest three digit number using the general value of the numbers and then we will find the predecessor of the smallest digit number by subtracting \[1\] from the smallest three - digit number.

**Complete step by step answer:**

Given : The predecessor of the smallest \[3\] digit number.

The smallest possible three digit number is the first number of the three digit number series which is \[100\].The predecessor of the smallest three digit number is given as :

\[\text{predecessor}= 100 - 1\]

\[\therefore \text{predecessor} = 99\]

Hence , the predecessor of the smallest three digit number is \[99\].

**Hence, the correct answer is option B.**

**Note:**The predecessor of a number is said to be the number which is just one less than the given number. The predecessor is obtained by subtracting \[1\] from the given number whereas the successor of a number is said to be the number which is just one more than the given number. The successor is obtained by adding \[1\] to the given number .

Examples for finding the predecessor and successor of a number are given as :If we have to find both the predecessor and successor of a number let us suppose that \[2\] .

Then , the predecessor is given as :

\[Predecessor = number - 1\]

Predecessor of \[2\] is : \[2 - 1\] I.e. \[1\]

Then , the successor is given as :

\[successor = number + 1\]

successor of \[2\] is : \[2 + 1\] I.e. \[3\]

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