[問題]GWD 6 Q13

[gimmy03]

Q13:
What is the remainder when the positive integer n is divided by 3?
(1) The remainder when n is divided by 2 is 1.
(2) The remainder when n + 1 is divided by 3 is 2.

Ans: B

Please help!! 3Q~

[汪汪北鼻]

Q13:
What is the remainder when the positive integer n is divided by 3?
(1) The remainder when n is divided by 2 is 1.
(2) The remainder when n + 1 is divided by 3 is 2.

Ans: B

Please help!! 3Q~

1)insuffieicnt, n=2a+1

2)sufficient, n+1=3b+2, n=3b+1, the reminder of n/3 is 1

thus, the choice is B

[gimmy03]

U save me.... Yeah... 3Q