5, 7, 12, 6, 8, 14, 7, (?), 16, 8, 10, 18.
(a) 8
(b) 9
(c) 10
(d) 12
Solution:
In the series when we add the first two numbers we get the third number.
5 + 7 = 12
6 + 8 = 14
7 + (?) = 16; now 16 – 7 = 9, therefore 7 + 9 = 16.
8 + 10 = 18
Answer: 9
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