19, 20, 21, ?, ?, 26, 28, 32, 33, 40
Which two numbers should replace the question marks?
22 , 24
There are two interwoven sequences.One starting at 19, alternate numbers progress by +2, +3, +4, +5 (i.e 19,starting at 20, alternate numbers progress by +2, +4, +6, +8 (i.e 20, 22, 26, 32, 40)