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OlympiadBench / 2288 / A bag contains 3 green balls, 4 red balls, and no other balls. Victor removes…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

answer type

Numerical

is multiple answer

false

language

English

question

A bag contains 3 green balls, 4 red balls, and no other balls. Victor removes balls randomly from the bag, one at a time, and places them on a table. Each ball in the bag is equally likely to be chosen each time that he removes a ball. He stops removing balls when there are two balls of the same colour on the table. What is the probability that, when he stops, there is at least 1 red ball and at least 1 green ball on the table?

question type

Open-ended

subject

Math

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Source and history

upstream_id / Original problem ID: 2288
task_id: 61a4d71e-5e0a-5d4c-9a83-d20537369c5c
task_key: OE~5fTO~5fmaths~5fen~5fCOMP--train--2288
task_revision_id: 1
config / split: OE_TO_maths_en_COMP / train

Official source

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