5th one ,how to solve?

[sujoy]

the numbers from 1 to m are written one after another as follows
123456...............m.This number is divisible by 3 if m is of the form
(n is a natural no.,):
1]3n [2] 3n-1 [3] 3n-2
Answer choices:
a]] only[1]
b]] [1] or [2] only
c]] [1]or[3] only

 

[Denis]

sujoy:
is 6 divisible by 3?
is 6 - 1 divisible by 3?
is 6 - 2 divisible by 3?

There's something real wrong with you and your posts;
as I said before, I think you're faking and fooling around;
how can you go from a post involving 2^31 * 3^19 to something like this... :?: :?: :?:

 

[sujoy]

its a real pleasure interacting with you sir
these are question no 10& 12 in a test paper which I could not solve.It is as [x+x+1+x+2] is integer, hence it must be in the form3n
however 3n-1 is also a ans why

 

[Gene]

If 123...m is divisible by 3 then the sum of the digits is a multiple of 3. (m+1)+(m+2)=2m+3 and that is divisible by 3. So the digits add to a multiple of 3 and putting them at the end gives a number 123...(m+2) whose digits add to a multiple of 3 and so the number is too. The next m' is m+3, another multiple and 123...(m'-1) =
123...(m+2) so both are. The answer is b.

 

[sujoy]

Yes sir
thank you

 

[Denis]

its a real pleasure interacting with you sir
these are question no 10& 12 in a test paper which I could not solve.It is as [x+x+1+x+2] is integer, hence it must be in the form3n
however 3n-1 is also a ans why

What can i say...
if you are sujoy from India, then I apologize.

Can you go here, then translate that song in Hindu?
http://www.geocities.com/EnchantedFores ... onald.html

 

[sujoy]

I will try to translate

then I apologize.

Now this is embarassing for me that a teacher should apologize.In India teachers are given utmost respect
Regards

 

[stapel]

Now this is embarassing for me that a teacher should apologize.

Some cultures are a little more egalitarian than others; some are a little more formal. You, I think, are coming from a more formal environment, and are dealing with people from a less formal one.

If we perceive that we may have caused offence or discomfort, we will generally apologize, even if to "only" a student (in part because we're not thinking of you as an "only" anything, just as a fellow human being).

It's just a little cultural difference. No biggie, okay?

Eliz.