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Find the sum of all four digit numbers (without repetition of digits) formed using 1,2,3,4,5
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there are 5x4x3x2 four digit numbers , without repetition of digits, using 1,2,3,4,5
yeah
We cannot use bijection here , if you are about to
oh, whats the bijection approach
like nothing fancy , Favourable cases = Total cases - unfavourable cases
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you can make a tree but it seems like a slow way
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