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If a:b = c:d, then b:a = d:c. This operation is termed:
ADividendo
BAlternendo
CComponendo
DInvertendo
Answer & Solution
Correct answer: D. Invertendo
1. Per OCR: "If a:b = c:d which implies b:a = d:c then we say that the operation of Invertendo is applied."
2. Invertendo = flip both ratios.
3. Distinct from Alternendo (a:c = b:d).
_Source: ICMAI BoS CMA Foundation Paper 3 (FBMS) — Paper3_07042026.pdf, Module 1 §1.1 (page 13)_