6, 9, 13, 16, 20, 23, ……..

A) 26, 30

B) 26, 31

C) 27, 30

D) 27, 31

First add 3 the 4 in whole series:

6+3=9 , 9+4=13

13+3=16 , 16+4=20

20+3=23 , 23+4=**27**

27+3=**30**

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