Step 1: Consider several different ways to randomly select two girls from 25 girls. According to the principle of multiplication, there are 25*24/2=300 kinds.
Step 2: Consider how many different ways to randomly select two people from all the students. 25+27=52 (human) 52*5 1/2= 1326 (species).
Step 3: Calculate the probability: 300/ 1326=50/22 1.
If you study combination, you can also use the formula of combination to find it.
It can be obtained by dividing the number of combinations of two elements randomly selected from 25 elements by the number of combinations of two elements randomly selected from 52 elements.