Question 389443

In first class 28 students, 15 females and 13 males.

In second class 25 students, 13 females and 12 males.


Here in each group must have at least 1 males.....

For first class....


no. of ways to select a group of 3 students from first class =28C3 - 15C3


here 28C3 is the no. of ways to select a group without any restriction.

and 15C3 is the no. of ways to select a group where all are females, no male.

so, we will eliminate those no. of ways in which all are females.


Now, understand the concept and find the no. of possible groups for second class yourself.


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