Question

What is Second Number among Following List ?
54, 89, 45

Answer 1

Series we have is 54, 89, 45. 

This can be arranged in increasing order or in decreasing order. 

Increasing Order - 45, 54, 89

Decreasing Order - 89, 54, 45. 

So, in both series, your second number in the series in 54. 

Answer 2

These numbers can be arranged in two types of series.
Ascending order series
Descending order series
In ascending order series numbers are arranged from lowest to highest numbers. So these numbers will form this series
45, 54, 89
In this series second number is 54.
In Descending order series numbers are arranged from highest to lowest numbers. This series will be
89, 54, 45
In this series second number is 54.