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Comuter science CH25 Computer - An Introduction — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9ScienceComuter science CH25 Computer - An Introduction1 Mark
MCQ
The people of China used ……………….
  • ✓
    abacus
  • B
    transistor
  • C
    vacuum tubes
  • D
    microprocessors
✓

Answer

Correct option: A.
abacus
abacus

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