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Which is bigger, 101410^{14} or 141014^{10}?

101410^{14} is bigger: 101410^{14} = 1.00000 × 101410^{14} and 141014^{10} = 289254654976.

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The curve ln x / x, which decides every comparison of a^b with b^a246810121416-0.3-0.2-0.10.10.20.30.4x = 10x = 14peak at eln x / x
The curve ln x / x, which decides every comparison of a^b with b^a. 10^14 against 14^10 is the same question as which of the two marked points is higher; the curve peaks at x = e.

How to work it out

  1. 1

    Compute both exactly: 101410^{14} = 100000000000000 and 141014^{10} = 289254654976.

  2. 2

    So 101410^{14} is bigger.

  3. 3

    The reason: taking logs, aba^{b} against bab^{a} is the same as ln⁡aa\frac{\ln a}{a} against ln⁡bb\frac{\ln b}{b}. The function ln⁡xx\frac{\ln x}{x} rises until x=e≈2.718x = e \approx 2.718 and falls afterwards. Both 10 and 14 are past e, where the function is decreasing, so the larger exponent loses and 101410^{14} > 141014^{10}.

    ln⁡1010 > ln⁡1414\frac{\ln 10}{10}\ >\ \frac{\ln 14}{14}
LaTeX source of the formulas on this page
\[ 10^{14} = 1.00000\times 10^{14}\ >\ 14^{10} = 289254654976 \]
\[ \frac{\ln 10}{10}\ >\ \frac{\ln 14}{14} \]

Questions

Which is bigger, 101410^{14} or 141014^{10}?

101410^{14} is bigger: 101410^{14} = 1.00000 × 101410^{14} and 141014^{10} = 289254654976.

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