Answer is 1. 500
Because, the ratio of taking economics to auditing is 4:3 and total number of students are 875.
Ratio 4:3 means 4+3 = 7, 4 out of 7 students takes economics and 3 out of 7 takes auditing (as mentioned)
Therefore, the number of students taking economics are 4/7 × 875 = 500

Hence, answer is 1. 500

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