Minute Mystery: The Secret Sequence

Bite-sized brain teaser to solve in a minute or less.

 

 

The Secret Sequence

Category: Logic, Number Pattern

Look at the sequence:
2, 4, 3, 6, 5, 10, 9, …
What is the next number in this sequence?

 

 

Solution

The pattern alternates between multiplying by 2 and subtracting 1.
  • Start with 2.
  • Multiply by 2 to get 4.
  • Subtract 1 to get 3.
  • Multiply 3 by 2 to get 6.
  • Subtract 1 to get 5.
  • Multiply 5 by 2 to get 10.
  • Subtract 1 to get 9.
  • The next step is to multiply 9 by 2, giving 18.

 

The next number in the sequence is 18.

 

 

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