### Brain Teasers

# Two Rules

Fun: (2.75)
Difficulty: (2.77)
Puzzle ID: #29364

Submitted By: RainyMysteria Corrected By: solarsistim321

Submitted By: RainyMysteria Corrected By: solarsistim321

Series
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.

There are two rules that need to be followed when doing these series.

12, 6, 3, 10, 5, 16, 8, ?, ?, ?

17, 52, 26, 13, 40, 20, 10, 5, ?, ?, ?

What do these two patterns have in common?

12, 6, 3, 10, 5, 16, 8, ?, ?, ?

17, 52, 26, 13, 40, 20, 10, 5, ?, ?, ?

What do these two patterns have in common?

### Hint

The first rule is about odd numbers and the second rule is about even numbers.### Answer

1st pattern is 4, 2, 12nd pattern is 16, 8, 4

The rules are:

If odd, multiply by three and add one.

If even, halve the number.

Both the numbers are doomed to a 4,2,1 pattern.

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## Comments

Very good teaser. I had to study it a bit to catch the pattern. I enjoyed it.

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