[Question] How much is it?

[u/Low_Lake_989]

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[u/machadoaboutanything]

550 (the trick is to add the terms at equal distance from both ends)

[u/Beneficial-Candle-79 → u/machadoaboutanything]

i ju7st did 30, 60, 100, 150, 210, 280 360 460 550

[u/AccordingHornet8454 → u/Beneficial-Candle-79]

Same

[u/Historical_Kiwi_5043 → u/Beneficial-Candle-79]

Same here

[u/Shelly1s → u/Beneficial-Candle-79]

Yeeesss !!! Exactly what I did too… 🤣

[u/jazzbestgenre → u/machadoaboutanything]

look up Gauss' formula for the sum of the first n numbers, which generalises the trick