The four sentences (labelled 1, 2, 3 and 4) below, when properly sequenced, would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer:
1. Various industrial sectors including retail, transit systems, enterprises, educational institutions, event organizing, finance, travel etc. have now started leveraging these beacons solutions to track and communicate with their customers. 2. A beacon fixed on to a shop wall enables the retailer to assess the proximity of the customer, and come up with a much targeted or personalized communication like offers, discounts and combos on products in each shelf. 3. Smart phones or other mobile devices can capture the beacon signals, and distance can be estimated by measuring received signal strength. 4. Beacons are tiny and inexpensive, micro-location-based technology devices that can send radio frequency signals and notify nearby Bluetooth devices of their presence and transmit information.
4312
The paragraph explains what beacons are, how they work, and how businesses use them, so it should move from definition to mechanism to application.
Sentence 4 opens the paragraph by defining beacons as tiny, inexpensive devices that send radio frequency signals to nearby Bluetooth devices. Sentence 3 follows by explaining how "the beacon signals" are captured by smart phones and how distance is estimated from signal strength. Sentence 1 then widens the scope: various industrial sectors have started leveraging "these beacons solutions" to track and communicate with customers. Sentence 2 closes with a specific example from retail, a beacon fixed on a shop wall that lets the retailer send personalised offers, illustrating the general claim in sentence 1.
The sequences starting with 2, 1 or 3 fail because each of these sentences refers to beacons ("A beacon fixed on to a shop wall", "these beacons solutions", "the beacon signals") before the reader has been told what a beacon is; only sentence 4 introduces the term.
Hence, 4312.
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