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(2n+3) - druga
(2n+5) - trzecia
(2n+7) - czwarta
(2n+9) - piąta
(2n+11) - szósta
2n+1+2n+3+2n+5+2n+7+2n+9+2n+11=420
12n+36=420
12n=384
n=32
(2*32+1)=65 - pierwsza
67 - druga
69 - trzecia
71 - czwarta
73 - piąta
75 - szósta
2n+1 + 2n+3 + 2n+5 + 2n+7 + 2n+9 + 2n+11 = 420
12n+36=420
12n=384
n=32
Szukane liczby: 65,67,69,71,73,75
65+67+69+71+73+75=420