SOLUTION: Out of a pool of 7 secretaries, only 3 can be chosen to work with a manager. How many ways can this happen?

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Question 690434: Out of a pool of 7 secretaries, only 3 can be chosen to work with a manager. How many ways can this happen?
Answer by farah(18) About Me  (Show Source):
You can put this solution on YOUR website!
i just have 1 way..by using calculator-casio fx750...ok,press 7..then,press shift X which consider as nPr,then press 3..it will display like this 7P3,press = and the answer will be 210. i hope u can understand my solution.or if my answer is wrong please press 7 and shift nCr and press 3..so it will display like this 7C3 and the answer is 35..thank you..