The number of ways in which 5 letters can be placed in 10 marked envelopes, so that no letter is in the right encelope, is

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

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 are 3 letters and 3 addressed envelopes coorresponding to their . The number of ways in which the letters be placed in the envelopes so that no letter is in the right envelope is

Find the number of ways in which 4 letters can be put in 4 addressed envelopes so that no letter goes into the envelope meant for it.

The number of ways in which 5 letters can be posted in 10 letter boxes 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

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

The number of ways in which four letters can be put in four addressed envelops so that no letter goes into envelope meant for it is

The number of ways in which 10 letters can be posted in five letter boxes is

The number of ways in which 10 letters can be posted in 5 letter boxes is