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a2=24
q=a2/a1=24/48=1/2
an=a1*q ^(n-1)
3/8=48* (1/2) ^ (n-1) /:48
(1/2)^ (n-1)=1/128
(1/2)^ (n-1)=(1/2)^ 7
n-1=7
n=7+1
n=8
liczba 3/8 to ósmy wyraz ciagu