#math challenge

[danielecheni18]

Cuando tenía 2 años, mi hermana me doblaba la edad. Ahora tengo 40, ¿cuántos años tiene mi hermana...?

[daily-challenges-wah]

Daily Challenge!

Math. Learn a reciprocal. Do some times tables. Become familiar with binary. Do it. Now.

Also happy two weeks to this blog!

[honeybee2807]

Good day ppl!

I have a complicated question. A ridiculously complicated question with an answer which was created by a convoluted thought process.

Guess what the answer is. If you get it right, you get a virtual cookie!

[thonethatflies620]

can someone give me the full number 52^52? everything gives me decimals and I'm too gay to do math right now

[qsolving]

Click to get More puzzles⬇️⬇️

MatchstickPuzzle

[mymathematics]

Math challenge Make Any Number From Four π's - Web Education

Math challenge Make Any Number From Four π’s Math challenge Make Any Number From Four π’s Happy Pi Day! Here’s the four pi’s challenge: writ

[mymathematics]

What Fraction Is Shaded? Challenge From The UK

This is a really fun geometry problem. It comes from the UKMT, a test which is part of forming the Olympiad team in the UK. Thanks to Liam for sending it to me! Can you figure it out?

[mathproblemz]

What is the probability that the number on the ball is odd or greater than 80 ?

The key word is *OR*.

What is the probability that the number is odd *OR* greater than 80?

P(A + B) = P(A) + P(B) - P(A,B)

Event A is removing a ball with an odd number. P(A) = 50/100 = 0.5

Event B is removing a ball with a number greater than 80. P(B) = 20/100 = 0.2

Event A,B is removing a ball with an odd number that is greater than 80. There are ten such balls. P(A,B) = 10/100 = 0.1

Also P(A,B) = P(A) x P(B) = 0.5 x 0.2 = 0.1

P(A + B) = 0.5 + 0.2 - (0.5 x 0.2) = 0.6

THE CORRECT ANSWER IS: (C)