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Which development makes several versions of a book affordable?

ALonger school day timings
BLarger school bag designs
CAdvances in printing tech
DFree teacher training camps
Answer & Solution
Correct answer: C. Advances in printing tech
1. Advances in printing technology now make it feasible to bring out several versions. 2. Costs stay low even for smaller print orders. 3. This allows regional, cultural and linguistic variations. _Source: NCERT Position Paper, National Focus Group on Teaching of Science, 6.2.4 Multiplicity of good textbooks_
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