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From 28 students buy magazine 10 The economist students, 10 Pravda students and 18 students don't buy any of these magazines. How many students buy both magazines?

Result

n =  10

Solution:

j=2818=10 n=10+10j=10+1010=10j=28-18=10 \ \\ n=10+10-j=10+10-10=10



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