Senthil1981 wrote:

duahsolo wrote:

If m is a positive integer with k nonzero digits and no other digits. Which digits appear in the number m?

(1) The sum of the digits is k

(2) k = 3

Given m is a positive number composed of k digits.

consider 1) sum of digits is k.

if m is just one digit then m has to be 1, so that k is 1 and sum of digits is k = 1,

similarly if m is 2 digit, then m has to be 11, so that k is 2 and sum is 1+1 = 2

so "which digits appear in the number m" is always 1, Hence select A and D

consider 2) k =3 , which can be from 111 to 999, except for ones with zeros in it. So not sufficient. Eliminate D.

Answer is A

Hi Senthil1981,

Please, "coping" solutions from the source of questions and posting them the way you're doing will not help maximise learning experience of others and myself. Having seen the question before, it helps if you can explain your solution to the question the way you have understood it or will help others to understand. I could have posted the official solution, if the intention was just to post questions and their official solutions.

Sometimes, we post questions to help us better understand how the questions are approached differently or how solutions to the questions are better explained, and to help others become exposed to questions of this nature.

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