B = 120 because it is in your sum
125.638 rounded to the nearest hundredth equal 125.64
Total number of volunteer students for a committee = 7
Number of committee = 5
Number of ways of selecting the committee from the 7 volunteers = 7C5 = 7!/(5!*2!) = 21 ways.
There are 21 ways in which the 5-committee member can be selected from the 7 volunteers.
The simplest form is 5/48
