Brain Test Level 347
Question: Complete the sequence: 66, 36, 18, ?
This level requires you to spot a recursive numerical rule.
Solution
The rule is to multiply the digits of the previous number to get the next number.
66 -> 6 x 6 = 36
36 -> 3 x 6 = 18
18 -> 1 x 8 = 8
The missing number is 8.
DIFFICULTY
Medium
PRO TIP
Try multiplying the digits of the numbers you see.