Number Series Problems: What should come in place of question mark (?)

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What should come in place of question mark (?) in the following number series: 15, 18, 16, 19, 17, 20, (?)

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The pattern of the number series is: 15 + 3 = 18 18 − 2 = 16 16 + 3 = 19 19 − 2 = 17 17 + 3 =...

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