Question

Find the wrong number in the series 289 256 225 196 168 144 121

Answer 1

Hi there!
Here's the answer:

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¶ The Actual series is of form
x², (x-1)², (x-2)², …


The given series is
289, 256, 225, 196, 168, 143, 121

But as per exact series,

289 = 17²
256 = 16²
225 = 15²
196 = 14²
169 = 13²
144 = 12²
121 = 11²

•°• 289, 256, 225, 196, 169, 143, 121 is the actual sequence.

Comparing given and actual series,
Odd term in the given series = 168


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Hope it helps