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The missing number is 21.

The reason is because you are adding seven and then subtracting one. You start out with 3 (3 + 7 = 10) then (10 - 1 = 9) then (9 + 7 = 16) and so on.

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14y ago

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Q: What is the missing number 3 10 9 16 15 22?
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