There are 6 items placed on the floor include a book, a ball, a brush, a calculator, a chicken leg and a stethoscope. Betty wishes to arrange them in the same row, iii) Betty's child likes circular objects which includes a ball, a brush, a chicken leg or a stethoscope with a higher chance of being picked. The probability that he picks circular objects is double compared to other remaining objects. Find the probability that Betty's child will choose a ball