What should come in place of the question mark (?) in the following number series?
12, 14, 17, 13, 8, 14, 21, 13, 4, ?

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None of the above

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Solution

The correct option is A 14
12 + 2 = 14, 14 + 3 = 17, 17 — 4 = 13, 13 — 5 = 8, 8 + 6 = 14, 14 + 7 = 21, 21 - 8 = 13, 13 — 9 = 4, 4 + 10 = 14

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