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There are greetings cards, each of a dif...

There are greetings cards, each of a different colour and 7 envelopes of same 7 colours as that of the cards. The number of ways in which the cards can be put in envelopes, so that exactly 4 of the cards go into envelopes of respective colour is,

A

`""^(7)C_(3)`

B

`2.""^(7)C_(3)`

C

`3!""^(4)C_(4)`

D

`3!""^(7)C_(3)""^(4)C_(3)`

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Knowledge Check

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