The rule is 5, 10, 15 and so the next number will be 20+31 = 51
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The rule is 5 10 15 20 25 30 .... etc and accordingly the next number in the sequence will be 106
The pattern here seems to be to add ten, then subtract five.16 + 10 = 2626 - 5 = 2121 + 10 = 31So: 31 - 5 = 26
-31. The rule is t(n) = -2n3 + 12n2 -19n + 14 where n = 1, 2, 3, ...
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16 to 26 (+10) 26 to 21 (-5) 21 to 31 (+10) 31 (-5) = 26 26