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Scholarship Exam Preparation App

Choose the place of the question mark in the series from number in the list

2, 4, 8, 5 : 3, 6, 9, 5 then 8, 11, 14, 12 : ?

a :

12, 9, 13, 15

b :

15, 12, 9, 13

c :

5, 9, 12, 8

d :

9, 13, 15, 12

Explanation :

First number +1Second number +2Third number +1Fourth number is kept the same.