Is non-negative integer x an even integer?

Question

Is non-negative integer x an even integer?
1)x<k, where k is the number of digits in x.
2)k=1

Self made

Vaidya · Answer

Given: x>= 0 and x is an integer.
From 1) If k is the number of digits in x and x < k, k must be equal to 1
(Eg: If k = 2, then x is a 2 digit number => no 2 digit number can be less than 2)

=> k = 1 and x = 0
=> 0 is even. Answer is YES.
Sufficient.

From 2) k = 1
We don't know the relationship between x and k. Hence, not sufficient.

Answer is A.

Bunuel · Answer

Thank you for the reply Vaidya. Just one note, it's not necessary to put your solution in spoiler.

Vaidya · Answer

Hi Bunuel, noted. I wasn't sure whether there's a rule about using spoilers and also assumed that people might be interested in solving the question themselves.

Bunuel · Answer

Those who want to solve a question themselves can look on the first post only and usually don't scroll down to the replies.

bumpbot · Answer

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Is non-negative integer x an even integer?

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