Answer :

To determine the number that will replace the question mark, let's analyze the given pattern in the sequence.

We have the following data points:
- (3, 5)
- (4) → 74
- (5) → ?

First, let's try to understand how the number 74 is derived from the input number 4. Let's think about possible relationships between these numbers.

A quick analysis suggests that:
- The number 74 could be seen as the concatenation of two digits, where 7 and 4 could be related to the numbers 3 and 5 somehow.

Let’s break this down step by step:

1. Consider the sequence `(4)` leading to `74`.
2. Look at the numbers `3` and `5` around the pair `(4)`.
3. We can hypothesize a pattern where the result `74` might be associated with the sum `3 + 5`.

Now observe the concatenation form:
- 7 could be directly related to `(3 + 5)` suggesting `3 + 5 = 8` but indirectly to 7 perarps
- And also concatenation with `4`

4 might be exactly the value come after concatenated with possibly derived value 7 inside.

Let's now apply similar pattern precedence rule to (5):

Consider input before, and `(3 + 5` will be select our tiny path 8)

So number choice constrain from similarly to (5) +

The result hence context similar:
- x = 5

- as lead term

This will yield derived = comparing concat (5, 9) where indirectly seen 74 led us to `95` likely comparable back.

Thus final should become:

Answer:
The number replacing the question mark is:
- 59

This satisfies role similar formation around propel concaten

(5) replaced matching need be:

Answer would Be: 59