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The Birthday Paradox: A Mind-Boggling challenge Card

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Signature Matte
18 pt thickness / 120 lb weight Soft white, soft eggshell texture
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About Folded Greeting Cards

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Size: Standard, 5" x 7"

Thank you, hello, or I love you, custom greeting cards are thoughtful gifts that are always the perfect way to express yourself.

  • Dimensions: 5" x 7" (portrait); 7" x 5" (landscape)
  • Full colour CMYK print process
  • Double sided printing for no additional cost

Paper Type: Signature Matte

Our Signature Matte paper is a customer favorite—smooth to the touch with a soft eggshell texture that elevates any design. Its sturdy 18 pt weight and natural feel make it the ideal choice for timeless, sophisticated events.

  • Exclusively made for Zazzle
  • Made and Printed in the USA
  • FSC® Certified—sourced from responsibly managed forests that protect both people and planet

About This Design

The Birthday Paradox: A Mind-Boggling challenge  Card

The Birthday Paradox: A Mind-Boggling challenge Card

Inside this intriguing birthday card, you'll find an exhilarating challenge that will put your mind to the test! Inspired by the famous "Birthday Paradox," this card dares you to unravel the enigma of shared birthdays. As you open the card, you'll be greeted with a visually captivating design, adorned with colourful confetti and festive illustrations, setting the perfect celebratory mood. But don't be fooled by the joyful exterior; this card holds a perplexing puzzle that will leave you scratching your head. The challenge begins as you read the instructions, which invite you to ponder the probability of two people sharing the same birthday in a group. Armed with a pen and a curious mind, you'll dive into an exploration of mathematics, statistics, and probability. The card provides you with a series of thought-provoking questions, guiding you through the steps to calculate the likelihood of a shared birthday. As you navigate through the perplexing equations and formulas, you'll be forced to confront the counterintuitive nature of the Birthday Paradox. But fear not, for the card also offers hints and tips to help you along the way. It encourages you to think critically and employ your problem-solving skills, challenging you to find the solution and unlock the secret of this fascinating paradox. Whether you tackle this challenge alone or share it with friends and family, this birthday card promises an engaging and stimulating experience. It blends the joy of celebration with the thrill of intellectual pursuit, making it a remarkable gift for those who love a mental challenge. So, embrace the paradox, celebrate your birthday in a unique way, and embark on a journey to unravel the mysteries of probability with this captivating "Unraveling the Birthday Paradox" birthday card. Are you ready to take on the mathematical challenge and discover the surprising truth behind shared birthdays?

Customer Reviews

4.9 out of 5 stars rating17.3K Total Reviews
16269 total 5-star reviews714 total 4-star reviews118 total 3-star reviews59 total 2-star reviews110 total 1-star reviews
17,270 Reviews
Reviews for similar products
5 out of 5 stars rating
By Debra J.April 17, 2024Verified Purchase
Folded Greeting Card, Size: Standard, 5" x 7", Paper: Signature Matte, Envelopes: White
Really pleased with the card quality. The perfect theme to personalize a birthday celebration. Birthday greeting combined with a Christmas wish for my nieces Christmas Birthday. Perfect! These colours really pop on this Matte finish. The cute funny monkey expressions add humour to a birthday card surprise.
5 out of 5 stars rating
By AnonymousOctober 1, 2025Verified Purchase
Folded Greeting Card, Size: Big, 8.5" x 11", Paper: Signature Matte, Envelopes: White
I absolutely love this!! Thank you so much for creating a very special birthday card for my mom for her very special day!
5 out of 5 stars rating
By Lisa B.August 21, 2023Verified Purchase
Folded Greeting Card, Size: Standard, 5" x 7", Paper: Signature Matte, Envelopes: White
Zazzle Reviewer Program
We ordered this for my mother in law’s 90th birthday. We used pictures from throughout the years. She loved the card and surely will bring tears and smiles whenever she looks at it. Printing was very clear

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Folded Greeting Cards
birthdayparadoxcelebrationmathematicsstatisticsprobabilitypuzzleintellectualcuriosityenigma
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birthdayparadoxcelebrationmathematicsstatisticsprobabilitypuzzleintellectualcuriosityenigma

Other Info

Product ID: 256853494054189950
Designed on 2023-07-09, 4:31 PM
Rating: G