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Q.1) Find seven digit number which is divisible by 3 in which repitition is not allowed.
asked in Combinatory by Active (2.4k points) | 50 views
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Just wrote random number 1234567 sum turned out to be 28, hence decided to add 2 more

1234569
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it become more complicated if i used this method ,can you give final answer ??
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How it becomes complicated?

A number to be divisible by three sum of its digits should be divisible by 3.

best is to write 3333333 but then numbers are not supposed to be repeated,

so I wrote 1234567 I came to know sum is 28 so I can replace any number by number+2 such that number won't repeat

1234587 or 1234569 would be possible outcomes.
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here you miss the position of zero .suppose the number 102345 now addition of 3 take place not 2.
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Yes it will be depend on situations

102345 don't add 3 as it will be repeated but you can add 6

1023456 or 1023459
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swapnil naik, what exactly do you want to say?? whats the answer??
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Utkarsha there are multiple answers possible. Question only says find a 7 digit number
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oh!! I was thinking over this over 5 mins! I thought question is HOW MANY 7 digit numbers rep not r allowed div by 3. Its not an easy problem.was wondering why "BASIC QUESTION" he has written!
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we have multiple option but only one answer is possible.is it not basic??
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it is a ambiguous question

there are many such numbers

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