If there's (.........) after a maths problem then it means the problem tends to infinity, this is a way to show Infinite series, the problem never ends.
Find n for the second time, and tell you twice that n is an Infinite series.
Don't Spam.
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Answer:
n=1-2+3-4+5-6+7-8+9
=(1-2)+(3-4)+(5-6)+(7-8)+9
=(-1)+(-1)+(-1)+(-1)+9
=(-4)+9
=5
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