10 11 15 12 12 8 4 12 10 10 5 13 18 20 ?

RRB NTPC Mains or Stage 2 Model Paper 3 with solutions

Question : 67 of 120

Marks: +1, -0

Solution:

1st column

={10 + 12+ 4 + 10}/2

= 18 ←Last number
2nd column =

{11+ 12+ 12+ 5}/2 = 20

3rd column

={15+ 8+ 10 + 13}/2= 23

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