To determine the next three missing numbers in the sequence, let's analyze the pattern of the sequences provided:

• Sequence 1: 15, 22, 28
• Sequence 2: 16, 17, 30
• Sequence 3: 20, 24, 28

Now, observe the changes in each sequence:

1. Sequence 1:

   • The difference between 22 and 15 is $22 - 15 = 7$.
   • The difference between 28 and 22 is $28 - 22 = 6$.

2. Sequence 2:

   • The difference between 17 and 16 is $17 - 16 = 1$.
   • The difference between 30 and 17 is $30 - 17 = 13$.

3. Sequence 3:

   • The difference between 24 and 20 is $24 - 20 = 4$.
   • The difference between 28 and 24 is $28 - 24 = 4$.

Analyzing the Pattern:

There doesn't seem to be a simple arithmetic or geometric pattern between the numbers. However, if we look at the differences between the corresponding positions:

1. The first position numbers increase by $+1$ between the sequences (15, 16, 20).
2. The second position numbers increase by a mix of small and larger differences (22, 17, 24).
3. The third position numbers are more irregular (28, 30, 28).

Next Sequence (4th Sequence):

Following the observed trends:

• First number: 15 → 16 → 20 → (possibly 21 or 25 based on the trend)
• Second number: 22 → 17 → 24 → (possibly 19 or 27)
• Third number: 28 → 30 → 28 → (possibly 32 or 30)

Considering these options, a reasonable guess could be 21, 19, 32.

So, the next three numbers are likely: 21, 19, 32.

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Do you want details or have any questions?

Here are five related questions you might find interesting:

1. How do you determine the pattern in more complex sequences?
2. What are the rules for finding missing numbers in a sequence?
3. Can sequences have non-numerical patterns?
4. How does the Fibonacci sequence differ from arithmetic sequences?
5. What are some common types of number sequences?

Tip: When analyzing sequences, always check for consistent differences or ratios. If there's no clear pattern, consider other possibilities like alternating sequences or combinations of different rules.