Logical Reasoning :: Number Series - Discussion

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Explanation:
Split the series as below
4,2,5 | 9,5,11 | 13,7,16 | 17,9,?

4,2,5 -> diff b/w 4,5 = 1
9,5,11 -> diff b/w 9,11 = 2
13,7,16 -> diff b/w 13,16 = 3
17,9,21 -> diff b/w 17,21 = 4