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a1=3
r=3
a2=a1+r
a2=3+3=6
a5= a1+4r
a5=3+ 4 x 3
a5=15
w ciągu geometrycznym
a1=5 q=1/2
a2= a1 x q
a2=5 x 1/2
a2=5/2= 2 i 1/2
a5= a1 x q4 ( q do potęgi 4 )
a5= 5 x 1/2 4 ( 1/2 do potęgi 4 )
a5= 5 x 1/16 = 5/16