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1+2+3+... +64 supra 1+2 +3+.. 63>13 supra 12

Răspuns :

(1 + 2 + .. + 64)/(1 + 2 + .. + 63) > 13/12

(64*65:2 )/(63*64:2) > 13/12

2080/2016 > 13/12

65/63 > 13/12

65/63 > 65/60 (f)