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In a group of 23 people the mathematical probability is more than half (.507) that two of them will have the same birthday. This is unintuitive but true! Let's test it out.

Major League Baseball teams have an active roster of 25 men. The probability is .569 that a team will have two players with the same birthday.

Angels

May 16 Williams Jerez, Jake Jewell
Jun 19 Austin Brice, Blake Parker
Aug 27 Jesus Castillo, Nick Tropeano

Astros

Mar 30 Alex Bregman, Jake Marisnick
Nov 24 Francis Martes, Chris Herrmann

Athletics

Mar 29 Matt Olson, Chad Pinder
Dec 21 Kendall Graveman, Khris Davis

Blue Jays

Feb 6 David Paulino, Luke Maile
Oct 10 Lourdes Gurriel, Troy Tulowitzki

Braves

Oct 2 Kyle Wright, Raffy Lopez
Oct 22 Jesse Biddle, Darren O'Day

Brewers

Feb 2 Adrian Houser, Troy Stokes
Jun 5 Jimmy Nelson, Manny Pina

Cardinals

Jun 3 Ramon Urias, Harrison Bader
Aug 23 Miles Mikolas, Lane Thomas
Oct 10 Genesis Cabrera, Kolten Wong

Cubs

Diamondbacks

Dodgers

Mar 11 Pedro Baez, Rich Hill
Apr 21 Edwin Rios, Joc Pederson
Apr 28 Matt Beaty, David Freese
Nov 23 Ross Stripling, Justin Turner

Giants

Oct 20 Ty Blach, Chris Shaw

Indians

Marlins

Mariners

Mets

Feb 12 Todd Frazier, Jordan Patterson

Nationals

Jul 20 Stephen Strasburg, Pedro Severino

Orioles

Jul 10 David Hess, Josh Rogers
Sep 11 Andrew Cashner, Evan Phillips

Padres

Mar 9 Anderson Espinoza, Craig Stammen
Mar 25 Phil Maton, Kirby Yates
Jun 3 Eric Lauer, Luis Urias
Nov 21 Robert Stock, Jose Pirela

Phillies

Apr 8 Zach Eflin, Carlos Santana
Aug 26 Ranger Suarez, Maikel Franco

Pirates

Sep 5 Jason Martin, Pablo Reyes
Nov 17 J.T. Brubaker, Elias Diaz

Rangers

Rays

Aug 7 Jose De, Michael Perez

Red Sox

Aug 21 Christian Vazquez, J.D. Martinez
Aug 26 Ryan Brasier, David Price
Sep 6 Marco Hernandez, Mitch Moreland

Reds

Jan 4 Raisel Iglesias, Michael Lorenzen
May 3 Homer Bailey, Amir Garrett
Sep 9 Jimmy Herget, Billy Hamilton

Rockies

Apr 1 Ryan Castellani, David Dahl

Royals

Feb 10 Tim Hill, Jorge Lopez, Alex Gordon
Jul 27 Brad Keller, Adalberto Mondesi
Dec 21 Danny Duffy, Josh Staumont

Tigers

Twins

Dec 27 Tyler Duffey, Addison Reed

White Sox

Yankees

Of 30 teams 21 had 2 players with the same birthday.
21/30 is 0.70