bob…

Saw this while waiting for the bus and wondering if there’s some secret/fancy math way to figure this out other than the obvious/regular add it up method:
“On a stairway of 100 steps, there is one pigeon on the first step, two pigeons on the second step, three pigeons on the third step all the way to the 100th step. How many pigeons are there in total?”
Any thoughts, resident mathy one?

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