Brain Test Level 289
Question: Find the missing number in the sequence: 18, 17, 15, 12, 8, ?
This level requires you to identify the decreasing pattern between the numbers.
Pattern Analysis
Look at the subtraction sequence:
18 - 17 = 1
17 - 15 = 2
15 - 12 = 3
12 - 8 = 4
The numbers being subtracted are sequentially increasing: 1, 2, 3, 4. The next number to subtract is 5.
Solution
Subtract 5 from the last number (8): 8 - 5 = 3.
The missing number is 3.
DIFFICULTY
Medium
PRO TIP
Check the difference between adjacent numbers. The subtraction value is increasing sequentially.