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Grade: 12
        

how many 5 digit numbers of distinct digits  can be formedsuch that the middle place isoccupied by largest number?

9 years ago

Answers : (2)

parameswara reddy paluru reddy
18 Points
							

       1 1 2 1 1 = 1 way

        x x 3 x x  =  2*3*1*3*3  

        x x 4 x x =    3*4*1*4*4

              and so on

        x  x 9 x x =   8*9*1*9*9

hence total no. of ways =  sigma n from 3 to 9      n3 (n-1)   

9 years ago
Vijay Luxmi Askiitiansexpert
357 Points
							

 

No more cases possible

 

Hence, answer = 8 × 8 ×7 × 6 + 7 × 7 × 6 × 5 + 6 × 6 × 5 × 4

 

+ 5 × 5 × 4 × 3 + 4 × 4 × 3 × 2 + 3 × 3 × 2 × 1

9 years ago
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