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Q: What is the next number of the following sequence ? 21, 77, 165, 285, ......

  • 1
    404
  • 2
    415
  • 3
    426
  • 4
    437
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Answer : 4. "437"
Explanation :

Answer: D) 437 Explanation: The series follow the rule,   21 = 77 = 92-4165 = 132-4285 = 172-4 5,9,13,17,21,(+4)...In the same way next no. will be 212-4 = 441 - 4 = 437

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