The number is 30C3 = 30!/[3!*(30-3)!] = 30*29*28/(3*2*1) = 4060
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Three students can be selected from 5 in (5 x 4 x 3) = 60 ways.BUT there are (3 x 2) = 6 ways to select the same 3 students.So there are only 60/6 = 10 different groups of 3 studentsthat can be selected from a pool of 5.
There are 3 ways. 30/56, 30 to 56, and 30 : 56.
-5
There are 30 ways of selecting the first student leaving 29 ways to select the second for a total of 30 X 29 = 870 ways
30% 3/10