Member: itachiuchihakujo

34 Questions
85 Answers

507

+321

Expect/Probability

Suppose you have a weighted coin in which heads comes up with probability 3/4 and tails with probability 1/4. If you flip heads, you win $2 but if you flip tails, you lose $1 What is the expected win of a coin flip in dollars?

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itachiuchihakujo May 9, 2021

465

+321

Discussion by Cases

How many positive integers less than 1000 have at least one digit of 0?

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itachiuchihakujo Apr 29, 2021

600

+321

Question

As shown in the diagram, a rectangular piece of paper ABCD was folded along CP where P is located one-third of the way from A to B. We know the total area covered by the folded paper is 213 square inches with a 75 square inch overlapping area. Find read more ..

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itachiuchihakujo Apr 19, 2021

635

+321

Inclusion and Exclusion

1.How many positive integers divide evenly into either 144 or 196 but not both?

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itachiuchihakujo Apr 19, 2021

601

+321

hard questions

1.Of all the four-digit positive integers containing only digits from the set {2,4,6,8} what fraction of them have at least one of their digits repeated?

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itachiuchihakujo Apr 19, 2021

467

+321

Quadrilaterals

Two long strips of paper are each 2 inches wide, and they overlap so that the angle between the strips is . What is the number of square inches in the area of the parallelogram formed by the overlap?
read more ..

ElectricPavlov ●

itachiuchihakujo Apr 12, 2021

644

+321

Combinations

A committee of 4 is to be chosen from a group of students. If the number of students in the group increases by 1, the number of different committees doubles. How many students are in the group?

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itachiuchihakujo Apr 12, 2021

641

+321

Combinations

There are 7 dots on a circle. What is the maximal number of intersection points outside the circle created by connecting these points with lines?

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itachiuchihakujo Apr 11, 2021

634

+321

Constructive Counting and Counting with Restrictions

A gardener has a circular garden, which he divides into four quadrants. He has four different kinds of flowers, and he wants to assign a flower to each quadrant so that adjacent quadrants are not planted with the same kind of flower. (Also, the gardener read more ..

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itachiuchihakujo Apr 10, 2021

472

+321

i am confused

Find the number of five-digit multiples of 5, where all the digits are different, and the second digit (from the left) is odd.

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itachiuchihakujo Apr 10, 2021

893

+321

Casework and Complementary Counting

How many 3-digit numbers contain exactly one 1? Examples include 510 and 771.

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itachiuchihakujo Apr 10, 2021

534

+321

Application of Linear Equations

Given $3x+\dfrac{2}{x}-4=2(x+9)-\left(7-\dfrac{1}{x}\right)$ what is $\dfrac{x^2+1}{x}?$

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itachiuchihakujo Apr 9, 2021

494

+321

Fractions and Decimals

What is the smallest positive integer n such that 1/n is equal to a decimal number with an 8 -digit repeating block?

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itachiuchihakujo Apr 9, 2021

506

+321

Help plz

What is the average of all positive integers that have four digits when written in base 3, but two digits when written in base 6? Write your answer in base 10.

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itachiuchihakujo Apr 9, 2021

+321

Thank you!!

itachiuchihakujoApr 19, 2021

+321

that's right thank you!!

itachiuchihakujoApr 19, 2021

+321

-1

–14– (–13)÷(–7+20)+(–18) = -31

itachiuchihakujoApr 19, 2021

+321

I am going to assume the expression was (-16-(-10)-:(-15+12)*13) = - 178/3

itachiuchihakujoApr 19, 2021

+321

alot...

itachiuchihakujoApr 16, 2021

+321

Lets say that
y = soup
our equation would be

3*18 = y
54 = y

itachiuchihakujoApr 12, 2021

+321

I think it is these too.

itachiuchihakujoApr 12, 2021

+321

HAHHAHAHAHHAHAHA..... this always tricks my brain but it is 27 because it doubles

itachiuchihakujoApr 12, 2021

Username	itachiuchihakujo
Score	321
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Questions	33
Answers	85