19, 28, 39, 54, 67, 84, 103
Identify the incorrect term in the given number series.

The correct answer is 54.

Step-by-step explanation:

To identify the incorrect term in the series 19, 28, 39, 54, 67, 84, 103, let's look at the differences between consecutive terms:

$28-19=9$

$39-28=11$

$54-39=15$

$67-54=13$

$84-67=17$

$103-84=19$

Notice the pattern formed by the differences. The differences should follow a sequence of consecutive odd numbers starting from 9: 9, 11, 13, 15, 17, 19.

According to this pattern:

The 4th term should be calculated as:

$39+13=52$

Checking the next term with 52:

$52+15=67$

This perfectly matches the rest of the sequence. Therefore, 54 is the incorrect term and should be replaced by 52.