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The National Highways (NH) in India are designated highways that connect major cities and towns across the country. Each highway is assigned a unique number, and the number indicates the direction, geographical location or the originating city of the highway.
In the given pairs, the cities mentioned for each National Highway are incorrect. Here are the correct city pairs:
1. NH 4 connects Mumbai and Chennai, not Chennai and Hyderabad.
2. NH 6 connects Hazira (near Surat) and Kolkata, not Mumbai and Kolkata.
3. NH 15 connects Pathankot and Samakhiyali, not Ahmedabad and Jodhpur.
Therefore, none of the given pairs in the question is correctly matched. It is important to note that the correct city pairs for National Highways may change over time due to infrastructure developments and changes in routes.