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Jane Street Capital
www.janestcapital.com New York, NY 150 to 499 Employees
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Interview Question for Assistant Trader at Jane Street Capital:
May 15, 2012

89 ^ 2?


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May 19, 2012

by Kevin:

8100-179=7921
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Jun 5, 2012

by Photius:

Alternatively:

90*88 + 1 = 7200 + 720 + 1 = 7921.

Alternatively again:

200*39 + 121 = 7800 + 121 = 7921.

See Ars Calcula for the mental math trick:

http://arscalcula.com/
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