Question 362370
no. of ways to select one letter for first place= 4



case 1: if numbers are used only once.

    no. of ways to arrange last four digit = 4!
 
    total no. of password possible = 4 * 4! = 96 



case 2: if numbers can be repeated
 
   no. of ways to arrange last four digit= 4^4 = 256 

total no. of password possible = 4*  256 = 1024 



so, (1024 - 96 ) = 928 more passwords possible.....



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