BEBRAS 2017 Grade 3-4 Round 2 Ext Question 10

Benno turns 11 today, but his mother has only five birthday candles. She puts them in a row. The rightmost lit candle has value 1; moving one place left doubles the value, so the second has value 2. Add the values of all lit candles: the rightmost two together give 2+1=3.



Which lighting pattern represents 11?