Componendo-Dividendo: $\dfrac{a + b}{a - b} = \dfrac{c + d}{c - d}$ holds when

Componendo-Dividendo: $\dfrac{a + b}{a - b} = \dfrac{c + d}{c - d}$ holds when
  1. $\dfrac{a}{b} = \dfrac{c}{d}$
  2. $ab = cd$
  3. $a - b = c - d$
  4. $a + b = c + d$

Solution

Combining componendo and dividendo gives this ratio.

Asked in: MH-SSC-9

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