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What is the electrostatic potential at the surface of a silver nucleus of diameter 12.4 fermi ? Atomic number silver is 47.

20 teachers of a school either teach mathematics or physics 12 of them mathematics white 4 teach both the subjects . The number of teachers teching physics only ,is

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In a school there are 20 teachers who teach mathematics or physics. Of these, 12 teach mathematics and 4 teach both physics and mathematics. How many teach physics?

In a school there are 20 teachers who teach mathematics or physics. Of these, 12 teach mathematics and 4 teach both physics and mathematics. How many teach physics?