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Robert found an old game in a closet and wanted to play it. However, a portion of the spinner shown at right could not be read. Find the missing portion of the spinner for Robert.

A spinner with 6 sections labeled as follows: 1 sixth, 1 third, 1 fourth, 1 ninth, question mark, 1 twelfth.

Since the spinner must land on any of the portions, all of the portions must add up to because each of the portions is relative to its probability.

Try finding the difference between  and the given probability portions. Since they have different denominators, you must find a common denominator for all of them and convert them to an equivalent fraction.