Solution:
Let x1=−y1,x2=−y2,x3=−y3,...,xn=−yn where y1,y2,y3,.......yn are positive numbers.
Now, the series is −y1,−y2,−y3,...,−yn (y1>y2>y3>y4>...>yn)
If the sign first and last term are changed, then the series in ascending order are
−y2,−y3,...−yn,yn,y1
Range =|y1|−|−y2|=|x1|−x2
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