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A box contains 10 devices, in which 7 are undefective and 3 are defective. You take 3 devices from the box. Find the expected value

A box contains 10 devices, in which 7 are undefective and 3 are defective. You take 3 devices from the box. Find the expected value (rounded to one decimal place) of the number of undefective devices taken from the box

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