[問題]考古題 Form19 sec5 PS-Q17

[凱薩琳]

Approximately what fraction of the integers betwween 100 and 400 are not multiples of 3?

(A)3/4
(B)2/3
(C)1/2
(D)1/3
(E)1/4

Ans:B

有公式可以算這題嗎？