Numerical answer
Directions: The five sentences below, labelled 1, 2, 3, 4 and 5, when properly sequenced form a coherent paragraph. Enter the correct sequence of numbers as your answer.
1. This is why lighthouses, despite satellite navigation making them technically redundant, are still maintained in many coastal regions today.
2. Before satellite-based positioning became reliable and widespread, sailors depended on visual landmarks, of which lighthouses were the most dependable at night or in poor visibility.
3. A ship's electronic systems can fail, lose power, or simply be absent on a small fishing vessel, and in such moments a lighthouse's beam requires no battery, no signal and no subscription to be useful.
4. Yet the redundancy argument, while statistically sound on average, ignores the specific conditions under which electronic systems are most likely to fail.
5. Modern GPS technology has made this reliance seem antiquated, and many governments have accordingly reduced funding for lighthouse maintenance in recent decades.
1. This is why lighthouses, despite satellite navigation making them technically redundant, are still maintained in many coastal regions today.
2. Before satellite-based positioning became reliable and widespread, sailors depended on visual landmarks, of which lighthouses were the most dependable at night or in poor visibility.
3. A ship's electronic systems can fail, lose power, or simply be absent on a small fishing vessel, and in such moments a lighthouse's beam requires no battery, no signal and no subscription to be useful.
4. Yet the redundancy argument, while statistically sound on average, ignores the specific conditions under which electronic systems are most likely to fail.
5. Modern GPS technology has made this reliance seem antiquated, and many governments have accordingly reduced funding for lighthouse maintenance in recent decades.
Show answer and solution
Answer: 25431
Sentence 2 opens with historical context: before GPS, sailors relied on lighthouses. Sentence 5 follows naturally, describing how GPS made that reliance seem outdated and funding declined. Sentence 4 pivots ("Yet") to the counter-argument that the redundancy claim ignores specific failure conditions. Sentence 3 supplies the concrete mechanism — electronics can fail, but a lighthouse needs no battery or signal. Sentence 1 concludes with the real-world outcome: lighthouses are still maintained despite being technically redundant. The coherent order is 2-5-4-3-1, i.e., digits 25431.
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