Coin

How many 50-cent coins must be put in a row that next 50-cent coins after them (above) rolled on it axis?

Result

n =  4

Solution:

120+60(n2)+120=360  n=4120 ^\circ + 60 ^\circ (n-2) + 120 ^\circ = 360 ^\circ \ \\ \ \\ n= 4



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