SOLUTION: what is the missing number 3 9 4 12 7 ? 16

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Question 243989: what is the missing number 3 9 4 12 7 ? 16
Answer by kamaldas(6) About Me  (Show Source):
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21

sequence is
3 9 4 12 7 ? 16
3 3*3 4 4*3 7 7*3 16
3 9 4 12 7 21 16