Mathematics, 11.08.2021 14:00 montgomerykarloxc24x
1. Ewa has 20 balls of four colors: yellow, green, blue, and black. 17 of them are not green, 5 are black, and 12 are not yellow. How many blue balls does Ewa have? (Use Gaussian elimination method).
Answers: 2
1. Ewa has 20 balls of four colors: yellow, green, blue, and black. 17 of them are not green, 5 are...
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