Numerical answer
Five sentences related to a common theme are given below. Four of them can be arranged into a coherent, meaningful paragraph while one does not fit. Identify the sentence that does not fit and key in its number as your answer.
1. Early mechanical calculators used gears and levers to perform arithmetic, requiring the operator to turn a crank for each operation.
2. Electronic calculators, introduced decades later, replaced these mechanical parts with circuits, making calculations nearly instantaneous.
3. The transition from mechanical to electronic calculation mirrored a broader shift occurring across many measurement and computing devices at the time.
4. Solar-powered calculators later removed the need for battery replacement, extending the devices' usable life considerably.
5. Many collectors today seek out vintage mechanical calculators specifically for their intricate, visible gear mechanisms.
1. Early mechanical calculators used gears and levers to perform arithmetic, requiring the operator to turn a crank for each operation.
2. Electronic calculators, introduced decades later, replaced these mechanical parts with circuits, making calculations nearly instantaneous.
3. The transition from mechanical to electronic calculation mirrored a broader shift occurring across many measurement and computing devices at the time.
4. Solar-powered calculators later removed the need for battery replacement, extending the devices' usable life considerably.
5. Many collectors today seek out vintage mechanical calculators specifically for their intricate, visible gear mechanisms.
Show answer and solution
Answer: 5
Sentences 1, 2, 3 and 4 form a coherent line describing the technological evolution of calculators: mechanical, then electronic, situated within a broader shift, then a specific electronic refinement (solar power). Sentence 5, about collectors valuing vintage mechanisms today, is a true but separate fact about present-day collecting behaviour rather than a step in the technological progression the other sentences trace.
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