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Q:

What is the next number of the following sequence ?

21, 77, 165, 285, ......

A) 404 B) 415
C) 426 D) 437

Answer:   D) 437



Explanation:

The series follow the rule,

 


21 = 
77 = 92-4
165 = 132-4
285 = 172-4


5,9,13,17,21,(+4)...
In the same way next no. will be
212-4 = 441 - 4 = 437

Subject: Number Series
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