PREVIEW
... ...
12(1+2+3+…N)-12{(1+2+3…+(N-1)}=6(N^2+6N)-{6(N-1)^2+6( N-1)}=12N
……
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...
In the auditorium, some people had already got up and left.
At this time, they seemed to have been cast a hold technique, and instantly stood on the spot.
Everyone's eyes stared at the screen unblinkingly.
Jeffrey said: "Perhaps, we can really witness a great moment today!"
The people around nodded.
Obviously, they all agree with this vie ...
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