What is the smallest three digit number where exactly two digit are the same

100

Step-by-step explanation:

We want to find a number of the form x y z

We want to of the digits to be the same and for it to be as small as possible

For the number to be small, we want x to be 1

1 y z

We can either have y or z be 1 or y =z

If y=z=0 that is smaller than y or z =1

100

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5