Missing Term in the Sequence:

To find the missing term in the given sequence, we first need to identify the pattern or rule that governs the sequence. Let's analyze the given sequence:

11. 7. 49
12. 8. 54
15. 4. ?

Identifying the Pattern:

Looking at the sequence, we can observe the following patterns:

1. The first number in each triplet increases by 1: 11, 12, 15.
2. The second number in each triplet decreases by 1: 7, 8, 4.
3. The third number in each triplet is the square of the first number: 49, 54, ?.

From these observations, it is apparent that the missing term should follow the same pattern.

Applying the Pattern:

1. The next number in the sequence should be 15 + 1 = 16.
2. The next number in the sequence should be 4 - 1 = 3.
3. The square of 16 is 256.

Therefore, the missing term in the sequence is 16. 3. 256.

Summary:

The missing term in the sequence 11. 7. 49, 12. 8. 54, 15. 4. ? is 16. 3. 256. The pattern observed in the sequence is that the first number increases by 1, the second number decreases by 1, and the third number is the square of the first number. By applying this pattern, we can determine the missing term.