Calculate the number 731
NUMBERMANIA: Calculate the number 731 using numbers [6, 1, 9, 7, 28, 520] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers: 0
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StethoscopeIn 1882, a stethoscope of the now classic design, invented by William F. Ford was issued a U.S. patent (No. 257,487). |