Question 1129119
.
<pre>
The complement event is that in a group of 8 people all have different birthdays,

and the probability of this complement event is 


    P' = {{{(364/365)*(363/365)*(362/365)*ellipsis*(358/365)}}} = {{{((365-1)*(365-2)*(365-3)*ellipsis*(365-7))/365^7}}} = 0.925665 (approximately).


Then the probability of the event under the question is the complement to it


    P = 1 - P' = 1 - 0.925665 = 0.074335 = 7.4335%.       <U>ANSWER</U>
</pre>

Solved.