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Description
The Monty Hall Problem: Beyond Closed DoorsThis short book explores the Monty Hall dilemma, a well known mathematical puzzle. The original problem, the controversy surrounding it and its solution are discussed. Further, the boundaries of the problem are expanded to consider prior knowledge and host intention. This book should be of interest to those who enjoy problem solving.
This short book explores the Monty Hall dilemma, a well known mathematical puzzle. The original problem, the controversy surrounding it and its solution are discussed. Further, the boundaries of the problem are expanded to consider prior knowledge and host intention. This book should be of interest to those who enjoy problem solving.
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4.3 ★★★★★
Based on 2467 reviews
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Product Reviews
★★★★★ 5
Let there be light!
Easy to assemble. Lights are very bright. Very sturdy even with terrible storms it's still working and bright
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2026
★★★★★ 3
Okay
I like that it fits my umbrella well, hinges open for easy application and removal, and that it has enough light for us to see our food at night.
I do not like that half of the outer lights do not work part of the time until I take out the batteries and swap them around.
Fine enough for the price, not worth the hassle of returning.
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Reviewed in the United States on May 10, 2025
★★★★★ 5
Perfect!
Lightweight and easy to use! Love the three light settings.
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Easy to use.
Works well. Light is bright. Our new patio umbrella does not have e a center pole, so the lights get somewhat blocked. But still pretty useful.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
Easy portability & Strong umbrella support
Size: 19inch
Its exactly as advertized!
Pros:
• rolls well
• medium sized (not a tripping hazard & corner fit under the edge of all my furniture)
• holds tall (through center of table) umbrella while open in minor wind with water-filled option.
• multiple size umbrella pole insert included
• Clear instructions.
• easy to use brakes (on 2 wheels for security...4 wheels would be annoying to use every day)
Cons:
• will still roll with brakes on with a little force when I'm being lazy...it should not be this easy (I usually have a corner of the stand tucked under a piece of furniture anyways)
• I would call this "light heavy duty" rather than "sturdy heavy duty" with water-filled option. I'd imagine sand + water as suggested would actually be heavy duty.
• re-design suggestion: base of umbrella could extend down below the water tank for sturdier hold, but this is the best I've found.
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Reviewed in the United States on May 19, 2026
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