A group of 10 people is randomly selected. What is the probability that 2 people in the group have the same birthday?

 The probability that 2 people in a group of 10 have the same birthday is 0.0722199145749855.

To calculate this probability, we can use the following formula:

probability = 1 - (365! / (365-n)! * n! * 365^n)

where n is the number of people in the group.

In this case, n = 10.

Plugging this value into the formula, we get:

probability = 1 - (365! / (365-10)! * 10! * 365^10)

probability = 1 - (365! / 265! * 10! * 365^10)

probability = 1 - (365 * 364 * 363 * ... * 356 * 355 * 354) / (365^10)

probability = 1 - (1.21645100408832e+157) / (3.15569525896764e+315)

probability = 0.0722199145749855