Consider the statement "If [math: x≡3(mod12)] and [math: y≡7(mod18)], then [math: x+y≡4(mod6)]". Which of the following is true?单项选择题

题目图片
A

The statement is true for all integers [math: x] and [math: y].

B

The statement is true for some integers [math: x] and [math: y] but not for all.

C

The statement is false for all integers [math: x] and [math: y].

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Is there an integer [math: z] such that [math: 504z≡7(mod385)] and [math: 0≤z<385]? If there is, enter such an integer [math: z]. If there isn't, enter NA.

Is there an integer [math: y] such that [math: 504y≡10(mod385)] and [math: 0≤y<385]? If there is, enter such an integer [math: y]. If there isn't, enter NA.

18+8%3-5/3

For integers a, b and k>0 which is NOT correct.

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