oblicz czwarty wyraz ciagu arytmetycznego jezeli a1=3 i a7=39
a7 = a1 + r*6
r = (39-3)/6 = 6
a4 = a1 + r*3 = 3 + 6*3 = 21
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a7 = a1 + r*6
r = (39-3)/6 = 6
a4 = a1 + r*3 = 3 + 6*3 = 21