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10 sats
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2 replies
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@ek
23 Sep
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on: (999^2 - 1)/998
charts_and_numbers
mhh, lol, I didn't think of calculating 999^2 in my head ... I thought there must be a trick somewhere.
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100 sats
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16 sats
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1 reply
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@Satosora
23 Sep
doing it on scratch paper helps. I thought it was going to be a lot harder.
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21 sats
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0 replies
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@south_korea_ln
OP
23 Sep
There is a trick.
Hint: remember the formula for (a^2 - b^2)...
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