-3
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7 4 11 2 14 5 18 3 21 ?

Find the next number in the sequence?

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  • 1
    $\begingroup$ Hi @mr21, welcome to Puzzling SE! Take the tour if you haven't already! While we do accept a wide variety of puzzle types, number sequence puzzles such as yours are generally not well received as they often do not have enough information to identify a single most correct answer. See this meta post for more information. Thanks! $\endgroup$ – PiIsNot3 Oct 19 at 23:06
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could be 6 because two sequences nested in one series (and the rule is +4,+3 and -2,+3 alternatingly)

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I think it is

6, because every second term differs by -2 then +3. 2=4-2, 5=2+3, 3=5-2, so ?=3+3=6.

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