If k is a positive even integer,then (k+1)(k+2).

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If k is a positive even integer,then (k+1)(k+2).
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If k is a positive even integer,then (k+1)(k+2).
If k is a positive even integer,then (k+1)(k+2).

If k is a positive even integer,then (k+1)(k+2).
20或30 ,这道题是OC官方脑残了