How many regions produce medium quality of Crop-1 or Crop-2 and also produce low quality of Crop-3 or Crop-4?
Explanation:
The regions that produce medium quality of Crop-1 or Crop-2 are R6, R7, R8, R9 and R13
The regions that produce low quality of Crop-3 or Crop-4 are R1, R4, R5 and R9
Thus, only region R9 produces medium quality of Crop-2 and low quality of Crop-4.
Hence, option (b).
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