Which two numbers should replace the question marks?

 Which two numbers should replace the question marks?

19, 20, 21, ?, ?, 26, 28, 32, 33, 40


the answer:

22 and 24: there are two interwoven sequences. Starting at

19, alternate numbers progress +2, +3, +4, +5. Starting at 20,

alternate numbers progress +2, +4, +6, +8.

Enregistrer un commentaire

Plus récente Plus ancienne