[計量] 一題PS練習題

[LoveDior (GO GO 加油~)]

在facebook上有加入一個gmat group
最近發的一道數學練習題 還沒公佈答案
我猜是(C)180 用5*3*2*3!亂推的
可是滿多人猜(B)的
大家有興趣算算看嗎? XD

Six three-female-representative delegations attend an international GMAT
conference sponsored by The 800 Test Academy. The representatives give a
double kiss on a cheek when they are introduced to one another.
How many kisses on a cheek are possible if each delegate gives a double kiss
on a cheek only once with every other attendent except with those of her
delegation?

(A)766

(B)270

(C)180

(D)144

(E) 72


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◆ From: 59.117.4.170
推 santa:Hi LoveDior~又是你!  這題挺有趣的  我猜(B)
→ santa:每人臉上有15個kiss  總共18人  15*18=270
→ LoveDior:哈哈~被發現了 >///<  你是數學神人耶(指)
→ LoveDior:這題繞的我頭好暈 囧 可是double kiss不用*2嗎?
推 santa:聽你這麼說 我也暈了..題目寫"a" double kiss所以我看成一個
→ santa:否則的話就要猜(A)了  但實在長得很不像答案....
→ LoveDior:哈哈~你也暈了~~這題真的好怪呀!! 囧