Q:
What is the next number of the following sequence ?
21, 77, 165, 285, ......
Answer & Explanation
Answer: D) 437
Explanation: The series follow the rule,
21 = 
77 =
165 =
285 =
5,9,13,17,21,(+4)...
In the same way next no. will be
= 441 - 4 = 437
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