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Mathematics 22 Online
OpenStudy (anonymous):

Find the sum of all four digit numbers (without repetition of digits) formed using 1,2,3,4,5

OpenStudy (perl):

there are 5x4x3x2 four digit numbers , without repetition of digits, using 1,2,3,4,5

OpenStudy (anonymous):

yeah

OpenStudy (anonymous):

We cannot use bijection here , if you are about to

OpenStudy (perl):

oh, whats the bijection approach

OpenStudy (anonymous):

like nothing fancy , Favourable cases = Total cases - unfavourable cases

OpenStudy (perl):

you can make a tree but it seems like a slow way

OpenStudy (perl):

|dw:1418137101679:dw|

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