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If a:b = c:d, applying alternendo gives:
Aa:c = b:d
Bb:a = d:c
Ca+b:b = c+d:d
Da-b:b = c-d:d
Answer & Solution
Correct answer: A. a:c = b:d
1. Per OCR: "If a:b=c:d which implies a:c=b:d then we say that the operation of Alternendo is performed."
2. Cross-pair the terms.
3. Invertendo flips; Alternendo cross-pairs.
_Source: ICMAI BoS CMA Foundation Paper 3 (FBMS) — Paper3_07042026.pdf, Module 1 §1.1 (page 13)_