for only girls--> 4c3/10c3
ony boys--> 6c3/10c3
atlest one girl--.1-(6c3/10c3)
_________________

Dear Experts,

I have the same doubt as TGC : as it is not mentioned that one student cannot occupy multiple position, wouldn’t that be a case of 'with replacement’

Regards
GRS

Hey, I am no expert but it is kind of obvious that the same student won't be the president, the vice president and the sec. I understand your point that it is not mentioned and in some organisations, these 3 positions could be held by the same person (Never heard of vice president and president being the same person). It's probably best to go with the most logical scenario here (its not outside knowledge just being logical). Again,I have no idea about the source of the question so an expert might be better at taking this.

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________