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24=a1+7
17=a1 r=7
czyli;
a1=17
a2=24
a3=27+7=31
a11=a1+10*7=17+70=87
Sprawdzamy;
a1; 17÷7=2 r3
a2; 24÷7=3 r3
a3; 31÷7=4 r3
a11; 12 r3