Assume that 130 students are surveyed and every student takes at least one of the following languages. The results of the survey are as follows: 72 take French. 72 take German. 39 take French and German. 36 take German and Russian. 19 take French as their only foreign language. 16 take French, Russian, and German. How many take Russian?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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Assume that 130 students are surveyed and every student takes at least one of the following languages. The results of the survey are as follows:

72 take French.
72 take German.
39 take French and German.
36 take German and Russian.
19 take French as their only foreign language.
16 take French, Russian, and German.

How many take Russian?

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