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Question

Four sentences that are a part of paragraph are given below; the sentences may or may not be in the right order; create the sequence that forms a coherent paragraph.

1. Look forward a few decades to an invention which can end the energy crisis, change the global economy and curb climate change at a stroke: commercial fusion power.

2. To gain meaningful insights, logic has to be accompanied by asking probing questions of nature through controlled tests, precise observations and clever analysis.

3. The greatest of all inventions is the über-invention that has provided the insights on which others depend: the modern scientific method.

4. This invention is inconceivable without the scientific method; it will rest on the application of a diverse range of scientific insights, such as the process transforming hydrogen into helium to release huge amounts of energy.

This question was previously asked in
CAT 2021 Question Paper with Solution (28-Nov-2021) (Slot-3)
The correct answer is

3214

The paragraph must introduce its main idea before any sentence refers back to it with "This".

Sentence 3 opens: the greatest invention is the über-invention behind all others, "the modern scientific method".
Sentence 2 explains what the method needs: logic "accompanied by asking probing questions of nature through controlled tests, precise observations and clever analysis".
Sentence 1 gives an example of a future invention: "commercial fusion power".
Sentence 4 closes: "This invention" (fusion power) "is inconceivable without the scientific method", tying the example back to 3.

4132 opens with "This invention", which has no referent.
2431 opens with the method's requirements before the method is named, and puts "This invention" after 2, where no invention has been mentioned.
1243 separates "This invention" from fusion power with the method sentence, and introduces the scientific method only at the end, after it has already been used.

The coherent order is 3, 2, 1, 4.

Hence, 3214.

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