[問題] pp2-ds 11,12
What is the value of the positive integer m ?
(1) When m is divided by 6, the remainder is 3.
(2) When 15 is divided by m, the remainder is 6.
答案B
我知道A不充分 但B為啥充分阿
我是這樣列式的 15=mx+6 變數有2個 這樣可以充分嗎??
Sets A, B, and C have some elements in common. If 16 elements are in both A
and B, 17 elements are in both A and C, and 18 elements are in both B and C,
how many elements do all three of the sets A, B, and C have in common?
(1) Of the 16 elements that are in both A and B, 9 elements are also in C.
(2) A has 25 elements, B has 30 elements, and C has 35 elements.
答案A
我也知道B不充分 但A哪裡有充分??
謝
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