My husband is a mathematical modeler and I would love to give him a model to announce to him that we're pregnant! He is a pharmacometrician and a neurologist and often uses R, PKPD, and Markov models, but also works avidly with other mathematics (though I wouldn't be able to tell you what). Is it possible to have some type of model/equation to equal pregnant/biological chemistry of being pregnant? My knowledge on these subjects are minute so any help would be greatly appreciated!

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    $\begingroup$ Congratulations :) :) I do not know about this. Hope some one helps you :) $\endgroup$ – user312648 Sep 14 '17 at 21:39
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    $\begingroup$ $1+1=3?{}{}{}{}$ $\endgroup$ – quasi Sep 14 '17 at 21:39
  • $\begingroup$ Something that first came to mind for me was matrix encryption, not sure if that is what you're looking for or not. $\endgroup$ – WaveX Sep 14 '17 at 21:43
  • $\begingroup$ Thank you @WaveX --> I'm not sure what a matrix encryption is (I'm in a completely opposite field) but, thank you for your support by comment! $\endgroup$ – Kate Sep 15 '17 at 22:03
  • $\begingroup$ And thank you @cello for the congrats! :) He's on a business trip, so it will be a great welcome home surprise! $\endgroup$ – Kate Sep 15 '17 at 22:05


Here's a possible fun approach:

Ask him to convert the following to base $36$:


The answer, in decimal form, is:


Converted to base $36$, where $a=10$, $b=11$, and so on up to $z=35$, that works out to:


He should probably use Wolfram|Alpha, and make sure he clicks the "More digits" button, until it sinks in.

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  • $\begingroup$ That would be $\frac{3,688,558,795,838,123,575,815,168}{4,738,381,338,321,616,895}$ in base 36. ;) $\endgroup$ – Grey Matters Sep 14 '17 at 21:58
  • $\begingroup$ Thank you so much @GreyMatters! I think he'll love this :) $\endgroup$ – Kate Sep 15 '17 at 22:01

A mother is $21$ years older than her son.

In six years' time the child will be $5$ times younger than her mother.

Question: Where is the father?


Attention to the question: Where is the father?


Attention to the question: Where is the father?



The boy is now ten years old.

The mother has today $Y$ years.

$\implies X + 21 = Y$

In $6$ years:

$5 (X + 6) = Y + 6$


$5X + 30 = X + 21 + 6$

$4X = -3$

$X = -\dfrac 34$

The boy is now $-\dfrac 34$ years, that is, $-9$ months.

So the father is ....

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