A researcher conducts a mixed factorial experimental design in which the within-subjects factor had three levels. If 60 total participants were observed in each group, then the between-subjects factor must have how many levels?
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In the given figure, a triangle ABC has been given in which AB = 7.5 cm, AC = 6.5 cm and BC = 7 cm. On base BC, a parallelogram DBCE of the same area as that of AABC is constructed.
Find the height DL of the parallelogram.
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