RRB Group-D Model Paper 11 with answers for online practice

Question : 97 of 100

Marks: +1, -0

Select the option that will correctly replace the question mark (?) in the series.
15, 19, 35, 71, ?

Solution:

15 +

(2)^2

= 19
19 +

(4)^2

= 35
35 +

(6)^2

= 71
71 +

(8)^2

= 135
So, the correct option will be option 4.

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