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Răspuns:
42 = 2 × 3 × 7 descompus in factori primi
a=2 , b=3 , c=7
a < b < c
²¹⁾1/2+¹⁴⁾1/3+⁶⁾1/7=
21/42+14/42+6/42=41/42 adevarat
a+b+c=2+3+7=12
raspuns c