Explanation

Let's examine the sequence:

19, 26, 33, 40, 47, 53

The differences between consecutive terms:

26 - 19 = 7

33 - 26 = 7

40 - 33 = 7

47 - 40 = 7

53 - 47 = 6

Given the pattern of differences is +7 consistently except for the last step:

The sequence follows a pattern of adding 7, but 53 - 47 = 6 breaks this pattern.

So, 53 is the odd one in the sequence.