In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one girl is included?  Choose the most appropriate option:
A) 145 B) 170 C) 195 D) 220 E) 245
The total number of ways to choose 4 children is 10C4 = 210   The number of ways to choose only boys is 6C4 = 15   The number of groups which include at least one girl is 195.   The answer is 195.
<result>C</result>
In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one girl is included?