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1, 12, 2, 10, 3, 8, 4, 6, (?), (?).
(a) 2, 3
(b) 7, 6
(c) 9, 8
(d) 5, 4
Solution:
In this series there are two groups of numbers.
1, 2, 3, 4, 5, (?) and 12, 10, 8, 6, (?)
1, 2, 3, 4, 5, (?); here add 1 to each number.
1 +1 = 2
2 + 1 = 3
3 + 1 = 4
4 + 1 = 5
5 + 1 = 6
12, 10, 8, 6, (?); subtract 2 from each number.
12 – 2 = 10
10 – 2 =8
8 – 2 = 6
6 – 2 = 4
Answer: 5, 4
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