Answers

2014-06-28T17:27:17+08:00
Counting numbers: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48 and 49. 
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what if in writing in roster notation.
Then, it is M={1,2,3,4,...,47,48,49}