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Count down to Christmas with maths!

Where do the magnetic fields of planets and stars come from?

- In this podcast Paul Shepherd tells us about the maths of football stadiums and why his work required him to listen to Belgian techno.
Amidst all the controversy of the FIFA World Cup 2022 there is also some football to be played. And where there's football, there's maths...

Tosin uses maths to guarantee the continued production of chocolate.

In this paragraph:

"Now imagine that there are $x_ n$ pairs of rabbits after $n$ months. The number of pairs in month $n+1$ will be $x_ n$ (in this problem, rabbits never die) plus the number of new pairs born. But new pairs are only born to pairs at least 1 month old, so there will be $x_{n-1}$ new pairs."

You say that new pairs are only born to pairs at least 1 month old but is this correct? Earlier you state that pairs can mate at 1 month but only produce new pairs at 2 months. Therefor new pairs are only born to pairs at least 2 months old (not 1 month old). If this is so, how does it affect your formula?

Thanks