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統計: A(556), B(135), C(55), D(20), E(0) #428322

詳解 (共 2 筆)

#691010
   1*2*3* (1+2+3+ .... +100)
= --------------------------------------
   1*3*5* (1+2+3+ .... +100)
36
0
#999481
2+2+2+2+2+.../5+5+5+5+5+.......= 2/5

5
1