[問題]天山 07-24

由 **rockermichael** » 2005-11-17 17:11

A certain restaurant offers 6 kinds of cheese and 2 kinds of fruits for its dessert platter.If each dessert platter contains an equal number of kinds of cheese and kinds of fruits, how many different dessert platters could the restaurant offer?

A.8
B.12
C.15
D.21
E.27

Ans: E

Please~ :sad

由 **zazer.lin** » 2005-11-17 17:35

rockermichael \$m[1]:A certain restaurant offers 6 kinds of cheese and 2 kinds of fruits for its dessert platter.If each dessert platter contains an equal number of kinds of cheese and kinds of fruits, how many different dessert platters could the restaurant offer?

A.8
B.12
C.15
D.21
E.27

上面那排紅色的字是問"放cheese和fruit的盤子有多少種組合"
(放一個cheese和放一個fruit) + (放兩個cheese和放兩個fruit) .....請注意綠色那段話
C(6,1)*C(2,1) + C(6,2)*C(2,2) = 27

由 **rockermichael** » 2005-11-18 18:09

thank you very much!!!

由 **yuying** » 2005-11-22 12:45

enim \$m[1]:
rockermichael \$m[1]:A certain restaurant offers 6 kinds of cheese and 2 kinds of fruits for its dessert platter.If each dessert platter contains an equal number of kinds of cheese and kinds of fruits, how many different dessert platters could the restaurant offer?

A.8
B.12
C.15
D.21
E.27

Ans: E

相同數目的cheese和fruit
各一+各二
=C(6,1)*C(2,1)+C(6,2)*C(2,2)
=12+15
=27

FYI

[問題]天山 07-24

[問題]天山 07-24

Re: [問題]天山7-24

誰在線上