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The strips used to build up area have width written as:
Ady
Bda
Cdb
Ddx
Answer & Solution
Correct answer: D. dx
1. Each vertical strip is a sliver along the x-axis.
2. Its width is a small change in x.
3. That width is written dx.
_Source: NCERT Class 12 Mathematics Part II, Chapter 8, Application of Integrals._
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