Instructions
Instructions: In each of these questions a number series is given. In each series only one number is wrong. Find out the wrong number.
Question 61

5531    5506    5425    5304    5135    4910    4621

Solution

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5531 - 52 = 5506 
5506 - 92 = 5425
5425 - 112 = 5304
5134 - 132 = 5135
5135 - 152 = 4910
4910 - 172 = 4621

Ever number after 5531 has a difference of a square.
Hence 5531 is the wrong number.

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