Answers

2015-11-17T11:13:10+05:30
The solution is simple .We can write 19 like XIX in Roman.So when we remove 1 it becomes XX that is 20.
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2015-11-17T11:27:58+05:30
the answer is as follows
19 can be written as XIX
if we remove 1 which is in middle,
we get XX which is coded as
20.
hence proved.






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