What number should replace the question mark in the train sequence?
Correct answer: -1
Explanation:
The sequence is 19, 15, 11, 7, 3, ?.
Each number decreases by 4:
19 - 4 = 15
15 - 4 = 11
11 - 4 = 7
7 - 4 = 3
So the next number is:
3 - 4 = -1
Therefore, the missing number is -1.
Finall answer to this puzzle: -1
