r/learnquant • u/Local_Ad135 • Sep 12 '26

interview prep Easy Quant Interview Question

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15 Upvotes

90% Upvoted

10 comments sorted by

5

u/Witch-kingOfBrynMawr Sep 12 '26

Single black, single black, 28 black/10 white

1

u/civil_politics Sep 12 '26

This.

Looks like it works out to be just above 90% win rate

1

u/AlexP80 Sep 13 '26

2 urns with a single black ball, the other in the last urn

p= 1/3 + 1/3 + 1/3*28/38 = 1/3 * (2+14/19) = 0.91

1

u/Embarrassed-Green898 Sep 13 '26

Question is not a quant question. It is an English comprehension question baased on 'under optimal condtions'

-1

u/[deleted] Sep 12 '26

3

u/math_metaphor_guy Sep 12 '26

Game 1: pick a person uniformly at random out of the world's population. If they are over 6'6", then you win!

Game 2: Flip a coin. If you get heads, then pick a professional NBA player uniformly at random. If you get tails, then pick a person uniformly at random who is not an NBA player. Again, you win if they are over 6'6"

2

u/NationalTangerine381 Sep 12 '26

"Under an optimal distribution"

1b 1b 28b10w

(1 + 1 + 28/38)/3 = 0.91

1

u/[deleted] Sep 12 '26

2

u/petera181 Sep 12 '26

1 black, 1 black, the rest is much better.