#1047 · Algebra · Sequences & series

Numbers with given means

If $12$ and $9 \frac{2}{5}$ are respectively the geometric and harmonic means between two numbers, find those two numbers.

~4 minAnswer checked instantlyGeometric meanHarmonic mean

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VI. Harmonical Progression, Examples VI.a, No. 4

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).