Each serving has 1/7 cup of apple juice and 1/7 cup of cranberry juice in it. That's a total of 2/7 cup of various juices in each serving.
(Were there some numbers next to the A. B. C. D. that you didn't copy ?)
In the recipe that makes 7 servings, there are approximately 7 2 cups of juice per serving. This is calculated by dividing the total 2 cups of juice by 7 servings. Therefore, each serving contains about 0.286 cups of juice.
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