Home
Class 12
MATHS
There are seven even greeting cards each...

There are seven even greeting cards each of a different colour and seven envelopes of the same seven colours. Find the number of ways in which the cards can be put in the envelopes so that exactly four of the cards go into the envelopes of the right colour.

Text Solution

Verified by Experts

The correct Answer is:
70
Promotional Banner

Topper's Solved these Questions

  • COMBINATORICS

    RESONANCE ENGLISH|Exercise Exercise-1 (Part-II RMO)|11 Videos

  • COMBINATORICS

    RESONANCE ENGLISH|Exercise Exercise-2 (Part-I: Previous Asked Question for Pre RMO)|17 Videos

  • COMBINATORICS

    RESONANCE ENGLISH|Exercise Self practice problems|30 Videos

  • APPLICATION OF DERIVATIVES

    RESONANCE ENGLISH|Exercise High Level Problems (HLP)|35 Videos

  • DEFINITE INTEGRATION & ITS APPLICATION

    RESONANCE ENGLISH|Exercise High Level Problem|26 Videos

Similar Questions

Explore conceptually related problems

If the number of ways in which 7 letters can be put in 7 envelopes such that exactly four letters are in wrong envelopes is N, then

The number of ways in which 5 letters can be placed in 5 marked envelopes, so that no letter is in the right encelope, is

There sre three letters asnd three envelopes. Find the total number of wys in which letters can be put into the envelopes so that each envelope has only one letter.

The number of ways in which four different letters can be put in their four addressed envelopes such that atleast two of them are in the wrong envelopes are

n different toys have to be distributed among n children. Find the number of ways in which these toys can be distributed so that exactly one child gets no toy.

n different toys have to be distributed among n children. Find the number of ways in which these toys can be distributed so that exactly one child gets no toy.

n different toys have to be distributed among n children. Find the number of ways in which these toys can be distributed so that exactly one child gets no toy.

The number of ways in which four different letters can be put in their four addressed envelopes that

There are 5 letters and 5 directed envelopes. The number of ways in which all the letters can be put in wrong engvelope, is

Ravish writes letters to his five friends and addresses the correspondig envelopes. The total number of ways in which letters can be placed in the envelopes so that at least two of them are in the wrong envelopes, is