[問題] GRE一題機率（應該吧ＸＤ）求教
From the set of 6 letter of A, B, C, D, E, F,
there are 20 different 3-letter subsets that could be selected.
Quantity A: The number of 3-letter subsets that include the letter F
Quantity B: 10
1) A > B
2) A < B
3) A = B
4) The relationship cannot be determined from the information given
答案是3
如果有板有有時間的話，還請給小的一點指點～感恩～
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→
10/23 21:43,
8年前
, 1F
10/23 21:43, 1F
推
10/23 23:07,
8年前
, 2F
10/23 23:07, 2F
→
10/24 03:35,
8年前
, 3F
10/24 03:35, 3F
→
10/24 03:36,
8年前
, 4F
10/24 03:36, 4F
→
10/25 02:05,
8年前
, 5F
10/25 02:05, 5F
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