50.How many combinations of students are possible if the group is to consist of all members of the same class?
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Answer – (D)
Solution:
This part of the problem seems similar to the first three parts but it is very different.
Here we want 6 freshmen or 6 sophomores or 6 juniors.
The group cannot be all freshmen since there are only 5 freshmen.
Therefore, the group can be a group of 6 sophomores or 6 juniors.
Number of groups of sophomores =C68=28
Number of groups of juniors=C67=7
Since we want the number of groups of 6 sophomores or 6 juniors, we want the sum of each of these possibilities:
=28+7= 35
Title : Permutation And Combination Q50
Description : 50.How many combinations of students are possible if the group is to consist of all members of the same class? A. 20 B. ...
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