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Grade: 11
        
In how many ways 6 letters can be placed in 6 addressed envelopes such that 1.at four letters are placed in correct envelopes 2.at most three letters are placed in wrong envelopes 
 
16 days ago

Answers : (1)

Arun
16262 Points
							
Dear student
 
this is a question of dearrangement
 
hence in 1st part
 
we have to calculate D4 = 9
 
in 2nd part 
wehave to calculate D2 + D3
16 days ago
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