How many possible ways are there for sending one unit from any refinery to any district?
A
63
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B
42
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C
54
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D
378
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Solution
The correct option is D 378 Number of refineries = 6 Number of depots = 7 Number of districts = 9 Therefore, the number of possible ways to send petrol from any refinery to any district is 6×7×9=378.