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Question: Its a value question, we need to know the units place of x, so irrespective of the no if we can get the same units place always, this should be fine.
(1) x = (25^2)/(10^n)
n is an integer, can be positive/negative and even/odd anything.
With any little slight change in value of n the units place digit will change => Not sufficient
(2) n^2 =1
Well n's units place must be always 1, but what about the relation b/w n and x? we still dont know anything about x => Not sufficient
Both combined. (1) + (2)
take n= -1 and n=1
again without any calculation we can see that we will get x=6250 and 62.5 respectively => Not sufficient
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