[計量] 請教一題比大小
請教一題比大小：
Of the 7 members of the city counsil, 4 are Democrats and 3 are Republicans.
T is the total number of different 3-person committees that can be appointed
from the council membership such that each comittee consists of 2 Democrats
and 1 Republican.
A) T
B) 15
答案 A，即 T > 15。
我反覆看了幾次，還是讀不懂題目的意思，請高手指點！
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