Calculate the number 549
NUMBERMANIA: Calculate the number 549 using numbers [1, 1, 7, 9, 73, 461] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers: 1
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Solar batteryIn 1955, a solar energy battery was first shipped from an American commercial factory, National Fabricated Products, Inc., Chicago, Ill. The battery was disc shaped, about the size of a half-dollar, with two terminals. It was hermetically sealed, and provided about half of a volt of electricity. |