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Option 3 : 6
[ alt="RRB-NTPC-29-03-2016-Shift-1 2 vvs (R) images Q23" src="//storage.googleapis.com/tb-img/production/17/05/RRB-NTPC-29-03-2016-Shift-1_2_vvs%20%28R%29_images_Q23.PNG" style="height:74px; width:313px">
The difference between the numbers form a series in increasing order of even numbers as shown above. To complete the series, 2 + 4 = 6 and 6 + 6 = 12. Hence 6 fits in well.
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