Find out the missing term of the number series given below.

54, 67, 50, 63, 46, ?

The correct answer is 59.

To find the missing term of the number series, let us analyze the pattern of the given sequence:
54, 67, 50, 63, 46, ?

Let's look at the differences between consecutive terms:

1. From the first term to the second term:
$54+13=67$

2. From the second term to the third term:
$67-17=50$

3. From the third term to the fourth term:
$50+13=63$

4. From the fourth term to the fifth term:
$63-17=46$

We can see that the series alternates between adding $13$ and subtracting $17$:
$+13,-17,+13,-17,...$

Following this alternating pattern, the next operation after subtracting $17$ should be adding $13$:
$46+13=59$

Therefore, the missing term in the series is 59.