Simple.Logics..
Test yourself...
Suppose you have group of candles such that they are connected with each other with 5cm long thread and if you lit up 1 candle then 4 candles will automatically lightened.
So, when u lit 1/2 candle then how many candles will lighten.?
(hint.: Every candles are connected by 5cm thread. use this statement for diagram)
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isnt it??