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plz solve..five digit number divisible by 3 is formed using 0,1,2,3,4,6,7 without repetition.Total number of such numbers are?

plz solve..five digit number divisible by 3 is formed using 0,1,2,3,4,6,7 without repetition.Total number of such numbers are?


 

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1 Answers

Chetan Mandayam Nayakar
312 Points
9 years ago

This problem has an extremely lengthy solution. Therefore I will simply give the algorithm of the solution.

first let us include zero. Then by trial and error, select a set of four other number from the given list whose sum is divisible by 3. The left-most digit cannot be zero. thus the left-most digit can be filled in 4 diferent ways. the remaining 4 digits can be filled up in 4*3*2*1 ways. Repeat this procedure for each set of 5 digits from the list containing zero.

now let us exclude zero. Again by trial and error select a set of 5 digits whose sum is divisible by 3. The digits can be arranged in 5*4*3*2*1 ways. Repeat this procedure for each set.

Add up all the number of formations above. This will give the answer.

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