Potatobird

61 Questions
16 Answers

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Janet's socks

Janet has 10 pairs of specialty socks, each pair in a different color. Suppose she randomly picks two out of the drawer without looking, what is the probability thatthe two socks are a matching pair?

Potatobird Mar 2, 2021

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Okay, then I'll just ask one question

Mary picks two different single-digit counting numbers and multiply them together. What is the probability that the product is 4?

Potatobird Mar 2, 2021

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some probability problems

1. An urn contains 6 red, 5 blue and 2 green marbles. If2marbles are picked at random,what is the probability that both are red?

2. At an ice-breaker event, ten people are randomly assigned to seats at a round table. Patrick read more ..

Potatobird Mar 1, 2021

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The ferries

If I do not wake up early enough, I will miss the bus.If I miss the bus, I will be late to the ferry terminal and miss the morning ferry. If I miss the morning ferry, I will have to wait for the afternoon ferry.

Assuming all of these read more ..

Potatobird Feb 25, 2021

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Mr. Prime and Mr. Third

Mr. Prime always tell the truth when the day of the month is a prime number (i.e. the2 nd, 3rd, 5th, 7th,...), and lies on other days. Mr. Third always tell the truth on days that are multiplies of 3 (i.e. the 3rd, 6th, 9th, 12th,...), and lies on other read more ..

Potatobird Feb 24, 2021

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Jason's 'sock dilemma'

Jason had a lot of socks in his sock drawer — 25 white socks, 10 red socks, 12 blue socks, 3 rainbow socks, 3 green socks, 7 purple socks. He forgot to pack his socks for the field trip, but he was already late, so he decided to just grab some number of read more ..

Potatobird Feb 24, 2021

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Jacob's little brother

Jacob’s little brother bragged that he could add all numbers from from 1 to 10 (55).Not to be outdone, Jacob said he could add all numbers from 1 to 100 (the answer is 5050).Perhaps because Jacob was a bit too smuck about it, Jacob’s little brother gave read more ..

Potatobird Feb 7, 2021

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The cake slices

Given a cake in the shape of a circle, how many pieces (not necessarily the same size)can you cut the cake into with 5 straight cuts?

Potatobird Feb 7, 2021

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The three digit arrow

A counting number is called a “three-digit arrow” if its tens digit is larger than both the hundreds digit and the units digit. For example,143,253,191are all arrownumbers, but 221and 405 are not.How many three-digit arrows are there?

Potatobird Feb 7, 2021

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The baseball league

A baseball league has Nt eams, and each team plays with every other team twice.There are a total of 90 games in a season. How many teams are there?

Potatobird Feb 7, 2021