As this is week 21 of the count up *and* it happens to be the 21st of the month, here is a problem involving the number 21:-
9 + 10 = 21
Is that impossible?
Turns out it’s not.
In fact there are many ways to make it true, but they involve dealing in number bases. So if number bases are not your thing, forget that side of things, and just enjoy this video from Presh Talwalker for its fascinating insight into the history of numbers.
And this is why we're doing a countUP
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