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There are 7 greetings cards, each of a d...

There are 7 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 envelops 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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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2019-MULTIPLE CHOICE QUESTIONS
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  8. The system of equations lambda x + y + 3z = 0 3x + mu y -z = 0 5...

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  15. A point is in motion along a hyperbola y = (10)/(x) so that its abscis...

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  16. Let a = min {x^(2) + 2x + 3 : x in R} and b = lim(theta rarr 0)(1-cos...

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  17. Let a gt b gt 0 and I(n) = a^(1//n) - b^(1//n), J(n) = (a-b)^(1//n) fo...

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  18. Let hat(alpha), hat(beta), hat(gamma)be three unit vectors such that h...

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