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The question has two assertions about geographical facts, which are evaluated individually here:
1. "In the world, the tropical deserts occur along the western margins of continents within the trade wind belt." - This is a correct statement. Tropical deserts, such as the Sahara, the Kalahari, and the Great Australian Desert, are usually found on the western side of continents.
2. "In India, the East Himalayan region gets high rainfall from north-east winds." - This statement is not fully accurate. The eastern Himalayas in India receive most of their rainfall from the south-west monsoons, rather than the north-east winds. The north-east winds, known as the retreating monsoons, mainly affect the eastern shores of India and contribute to winter rainfall over the region.
Thus, option 1, "1 only", is the correct answer because only the first statement is correct.