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Math Problems @MathQuizzes

Short math problems, mind training, science quizzes. Joined June 2014
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  • Following
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Math Problems @MathQuizzes

11 years ago

I have 11 coins on a board, all tales up. In a step, I can turn exactly 5 coins. Can I have all heads up in 7 steps? And in 6 steps?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

Can I cut up a symmetric octogon into parallelogramms of equal area?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

If n+1<k<2n, can n number of lines divide a plane into k subplanes?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

Find a factorization for 4x^3 - 11x - 3

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

Given 2 ropes, known that both of them burn down exactly in 1 hr. How can you measure exactly 15 min by burning the ropes? (Don't fold them)

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

I have two bottles, a 3L and an 5L one. I have infinite water. How can I measure out exactly 4L water with these?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

I've got n coins, one of them is heavier, others are the same. I have a balance. How many measures do I have to take to find the odd one?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

How many 150-digit numbers are there, where all the digits are even numbers, and any digit differs by 2 from the previos and the next digit?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

Solve! y ′ (x) = y^2 (x) · cos(x), y(0) = 2,

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

Spse I have a set that follows normal dist. with m = 6 and sigma = 12. Where are the inflection points of the prob. density function?

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Math Problems @MathQuizzes

11 years ago

What does (7+3i)/(7-3i) equal to?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

@coleandreola oh you do?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

If A is an m × n matrix and B is n × p matrix, is the transpose operation distributable over their matrix multiplication? Is it commutative?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

Let (ABC) and (CBA) be two decimal numbers, where A,B and C stand for different digits. Can it be that both of them is a multiple of seven?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

Where exactly is the point inside a triangle, where the product of the distances from the sides is the largest?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

So who is the quickest to anti-derivate (1/cos^3(x))?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

@geek_ahm I admit the problem is a little hard. Do you need a hint?

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Math Problems @MathQuizzes

11 years ago

@BigMathMike Yes it is :)

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

If a and b are positive numbers, and (x, y) is a point on the curve ax^2 + by^2 = ab, what is the largest possible value of xy?

MathQuizzes Profile Picture

Math Problems @MathQuizzes

11 years ago

@geek_ahm That is sadly incorrect.

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