A) 143
B) 63
C) 257
D) 15
Correct Answer: C
Solution :
The given numbers can be written as follows: \[143={{12}^{2}}-1;\text{ }63={{8}^{2}}-1;\text{ }195={{14}^{2}}-1;\] \[15={{4}^{2}}-1\] But, \[257={{16}^{2}}+1\] Obviously, except 257, others can be written in the form \[{{x}^{2}}-1\].You need to login to perform this action.
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