Fulfill ONE of the following requirement to enter this slot.
a) You are a Hong Kong mapper.
b) Your map is related to touhou for mokou/satori/mima/flandre OR vocaloid of lily/kagamine Rin OR classical/instrumental pieces.
c) Finish my maths challenge.
以下三項完成至少一項:
1) 你是香港mapper。
2) 你的圖是東方裡面妹紅/小覺/魅魔/二小姐的歌;vocaloid被面lily/鏡音的歌;古典/純音樂其中一種。
3) 完成我的計算題。
Maths challenge/問題
Question TWO (# of correct ans = 2, # of wrong answer = 0)
Find the infinite sum of x^2/2^x. i.e., 1/2 + 4/4 + 9/8 + 16/16 + 25/32 + ......
求通項為x^2/2^x的數列無限和, 即1/2 + 4/4 + 9/8 + 16/16 + 25/32 + ......Question THREE (Changed) (# of correct answers = 0, # of wrong answer = 0)
Show that the triangular inequality is equivalent to 
證明三角不等式與
等價The past questions can be found in my
userpage The priority is highest but total length shall be < 15 min.