Please help me with this question. I totally have no idea why the options have decimals Thank you
Notice that when the chain hangs vertically, the rings are alternately in one of two planes, either in the same plane as the top ring or in a perpendicular plane. If the chain has an odd number of rings in it, then the bottom ring will have a whole number of 180º twists. But if the chain has an even number of rings then the bottom ring must have an additional half-twist.
Thank you explaining!!
Is my reasoning below right?
if it's two rings, the bottom ring makes .5 twist.
if there're 3 rings, the bottom ring makes .5 + .5 twist.
if there're 6 rings, it should be 2.5 twist.
The answer is B(.5, 1.5, 2.5) but i don't understand why it's given as .5, 1.5 and 2.5 and not just 2.5 twist.