[機經]數學 either in bond or in stocks?
※ 引述《growthme (咖啡人)》之銘言：
: 38. A financial investment club has *A* members with investment either
: in bond or in stocks. *B* don't invest in either of them. *C* invest
: in stock. *D* invest in bond How many people invest in both?
: JJ 原題是不確定的數字 ABCD 是我自己假設的符號
: 所以想請問這題的思考方式有沒有不正確
: A= either stock or bond
: B= do not invest in either
: C= stock
: D= bond
: 所以 BOTH= C+D-A
: 以上問題麻煩大家了
我的想法和g大一樣
either in bond or in stocks(A) = stocks + bond - both
所以 both = stocks + bond - A
CD上有人認為either in bond or in stocks = only in bond + only in stocks
所以 A= stocks - both + bond - both
both=(stocks + bond - A)*1/2
究竟是哪一個呢??
拜託大家了
感恩
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by mayeve
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09/15 00:57, , 1F
09/15 00:57, 1F
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