## Chance for a Would-be Bride

There was a tradition in old Russia. A would-be bride gathers six long pieces of straw and grasp them in her hand. She then randomly ties pairs of knots on the top and the bottom. Since there are six blades of grass sticking out above and below the hand, she will tie three knots on the top and three knots on the bottom. If she forms one big ring, she gets married soon.

Estimate the probability that the girl will get married soon.

The problem is mentioned in The New York Times NUMBERPLAY and it is credited to Sunil Singh.

## The logic puzzle almost everyone gets wrong

This is a very famous logic problem:

“Jack is looking at Anne, but Anne is looking at George. Jack is married, but George is not. Is a married person looking at an unmarried person?

• A: Yes
• B: No
• C: Cannot be determined”

According to the Keith E. Stanovich in Scientific American more than 80 percent of people choose C, which is not the correct answer. The correct answer is A. Why?

This is another example of a similar problem:

There are only two handshakes in a meeting: John shakes hands with a person, this person shakes hands with Anna. Does a man shake hands with a woman in the meeting?

## Extraordinary Math Teaching by Dan Finkel

Dan Finkel suggested principles of extraordinary math teaching:

Math can the best of time or the worst of time.

2) Thinking happens only when you have time to struggle.

3) (Teacher), you are not the answer key.

4) Say yes to your students’ ideas.

5) Play!

A marvelous quotation is attributed to the most brilliant scientist of the modern age, Albert Einstein: “Play is the highest form of research.”

## Mathematical Problems of Love

Are there math problems of Love. Certainly, there are many of them. The theme is very important for teenagers.

• What are chances of being chosen?
• How long do gentlemen wait ladies?
• How many roses are needed?
• How much do I spend for a present?
• How Gerry must to play so that Jane always wins?
• How to share the family income?
• How to manage family projects?

There are many examples of such simple questions and answers at the page www.aplusclick.com/love.htm

Gerry Geek’s love story in form of math problems is passionately described in his book at Amazon.

Hannah Fry’s TED Talk on the subject: