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Question 2
Select the number that can replace the question mark (?) in the following series.
15, 18, 13, 20, 11, ?
Solution
Given series 15, 18, 13, 20, 11, ?
in the series going on two-part firstÂ
  15 - 2 = 13Â
13 - 2 = 11 and so on
and $$ 2^{nd} part
18 = 2 = 20
20+2 = 22 (?)
? = 22 AnsÂ
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