Dear Bunuel ,
Though what is written is correct that we need to select the codes such that they are in alphabetical order , won't ba qualify as a different code than ab .
Where is it mentioned that if we are writing a code which has "a" at second place is invalid ?
In this case 4x3 different codes are possible by 4 letters . Why do we need 5 ?
Though what is written is correct that we need to select the codes such that they are in alphabetical order , won't ba qualify as a different code than ab .
Where is it mentioned that if we are writing a code which has "a" at second place is invalid ?
In this case 4x3 different codes are possible by 4 letters . Why do we need 5 ?
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