2, 7, 9, 3, 8, 11, 4, 9, 13, (?), 10, 15.
(a) 3
(b) 4
(c) 5
(d) 6
Solution:
In the series when we add the first two numbers we get the third number.
2 + 7 = 9
3 + 8 = 11
4 + 9 = 13
(?) + 10 = 15; now, 15 – 10 = 5; since 5 + 10 = 15
Answer: 5
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