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The correct sequence of the given Indian cities in decreasing order of their normal annual rainfall is Kochi-Kolkata-Patna-Delhi as stated in option 3. To break it down:
1. Kochi, located in Kerala, typically receives the highest annual rainfall due to the monsoon winds from the Indian Ocean. It is one of the first cities to receive the Southwest Monsoon in India.
2. Kolkata, being a coastal city located in West Bengal receives the second highest rainfall among the mentioned cities. Its rainfall is influenced by the Bay of Bengal branch of the monsoon.
3. Patna in Bihar contributes third to this list. The city receives moderate rainfall from the monsoon winds.
4. Delhi being farthest from both the coasts receives the lowest rainfall among these cities. It receives rainfall from the western disturbances and the monsoon.
Other options give a different order, hence they are incorrect. The order of the cities in terms of normal annual rainfall remains the same i.e., Kochi-Kolkata-Patna-Delhi.