This is my explanation
# of groups that have atleast on french teacher = total # of groups possible - # of groups that doesn't have any french teacher
= 10C3 - 6C3 = 120 - 20 = 100.
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gmat prep combinations
Source: Beat The GMAT — Data Sufficiency |
Atleast one frechie means the following are the possible combinations
1-French 2-Other OR 2-French 1-other OR 3-French 0-Other
Add up all these possibilities -
4C1 x 6C2 + 4C2 x 6C1 + 4C3
= 4 x 15 + 6 x 6 + 4 = 60 + 36 + 4 = 100
I hope this helps
1-French 2-Other OR 2-French 1-other OR 3-French 0-Other
Add up all these possibilities -
4C1 x 6C2 + 4C2 x 6C1 + 4C3
= 4 x 15 + 6 x 6 + 4 = 60 + 36 + 4 = 100
I hope this helps
