How many different committees can be formed from 8 teachers and 48 students if the committee consists of 3 teachers and 4 stude
2 answers:
Since we don't care about the order in which we select people, we will use the combinatoric approach, rather than permutations.
Since we want to select 3 teachers from a total of 8, this is the notation to select 3 teachers from 8 (objects).
Teachers :
Similarly, students :
Now, since we want both at the same time, we will need to multiply both to yield your final answer:
different ways.
Since we want to select 3 teachers from a total of 8, this is the notation to select 3 teachers from 8 (objects).
Teachers :
Similarly, students :
Now, since we want both at the same time, we will need to multiply both to yield your final answer:
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The answer is 10.73 years.
Here, the formula we can use is :
(for the average)
Substitute the values mentioned in the question.
10.54 = (10.35 + Girls)/2
21.08 = 10.35 + Girls
Girls = 10.73 years