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25.A postman has to deliver five letters to five different houses. Mischievously he posts one letter through each door without looking to see if it is correct address. In how many ways he could do this so that exactly two of the five houses recieve correct letter?? |
| Answer» 25.A postman has to deliver five letters to five different houses. Mischievously he posts one letter through each door without looking to see if it is correct address. In how many ways he could do this so that exactly two of the five houses recieve correct letter?? | |