SSC CPO 13th Dec 2019 Shift-1 Question 2

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 first 

   15 - 2 = 13 

13 - 2 = 11 and so on

and $$ 2^{nd} part

18 = 2 = 20

20+2 = 22 (?)

? = 22 Ans 



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