34 because differences going up is 3 then 6 then 9 then 11 so then its 13+21=34
* * * * *
And since when is 3, 6, 9, 11 a sequence? of any kind?
One possible solution is
t(n) = (-5x4 + 50x3 - 157x2 + 232x - 108)/12 n = 1, 2, 3, ...
then t(6) = -4
24
24
24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
27
27
The next number is -21
16 to 26 (+10) 26 to 21 (-5) 21 to 31 (+10) 31 (-5) = 26 26
28
16+10=26 26-5=21 21+10=31 31-5=26 so the next no. is 26...
16+10=26 26-5=21 21+10=31 31-5=26 26+10=36
1921.... You have 7 9 then add 1 , 2 so get 10 12 13 15 16 18 19 21
16+10= 26 26-5= 21 21+10= 31 31-5= 26 The answer is 26