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2. Ratio - Wikipedia

   en.wikipedia.org/wiki/Ratio

   The ratio of numbers A and B can be expressed as: [6] the ratio of A to B; A:B; A is to B (when followed by "as C is to D "; see below) a fraction with A as numerator and B as denominator that represents the quotient (i.e., A divided by B, or). This can be expressed as a simple or a decimal fraction, or as a percentage, etc. [7]

3. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Notes that sound well together to a Western ear are sounds whose fundamental frequencies of vibration are in simple ratios. For example, an octave doubles the frequency and a perfect fifth multiplies it by 3 2 {\displaystyle {\frac {3}{2}}} .

4. ISO 216 - Wikipedia

   en.wikipedia.org/wiki/ISO_216

   All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √ 2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series ...

5. Major depressive disorder - Wikipedia

   en.wikipedia.org/wiki/Major_depressive_disorder

   Vitamin B 2, B 6 and B 12 deficiency may cause depression in females. [61] A 2025 study suggests that depression affects not only mental health but also accelerates the development of chronic physical conditions. [62] Individuals with a history of depression are at a higher risk of developing long-term health issues, including heart disease and ...