A formula for solving the inclusion exclusion principle The two formulas of inclusion exclusion principle are: (a ∪ B = a + B - a ∩ b) and (a ∪ B ∪ C = a + B + C - a ∩ B - B ∩ C - C ∩ a + Don't give me a lot of examples. I want explanations. The more detailed, the better, | Math enthusiast | Mathematical art

A formula for solving the inclusion exclusion principle The two formulas of inclusion exclusion principle are: (a ∪ B = a + B - a ∩ b) and (a ∪ B ∪ C = a + B + C - a ∩ B - B ∩ C - C ∩ a + Don't give me a lot of examples. I want explanations. The more detailed, the better,

This is the first formula

The second formula

I don't know if I can understand it from the graph?

How to calculate the frequency of alternating current and what is the formula

The frequency f of alternating current is equal to the speed n of generator, that is, f = n

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