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A,b and c is in line ,in such way that (a--b------c)
this is called golden ratio
fibonacci series = fn+fn+1=fn+2
1,1,2(1+1),3(1+2),5(2+3),8(3+5) and so on
and if you divide 3 (successor)/2 (previous number) =1.6 approximately
and 5/3=1.6

1 5 1
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