We drew the HR diagram of star clusters. While a cluster contains a number of stars in the upper right corner of the diagram, the other cluster has no star in the upper right corner of the diagram. Which of the star clusters is older? Select one or more: a. a star cluster without any star in the upper right corner of the HR diagram b. a star cluster with many stars in the upper right corner of the HR diagram c. We need more information to find an older star cluster.

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