How to do 191st question?

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2 Answers
Mar 16, 2018

See the answer below...

Explanation:

  • When there is one lady, there is five gentleman in the committee. The ways to form the committee is color(red)((""^6C_5xx""^5C_1)=30 .
  • When there is two lady, there is four gentleman in the committee. The ways to form the committee is color(red)((""^6C_4xx""^5C_2)= 150.
  • When there is three lady, there is three gentleman in the committee. The ways to form the committee is color(red)((""^6C_3xx""^5C_3)=200 .
  • When there is four lady, there is two gentleman in the committee. The ways to form the committee is color(red)((""^6C_2xx""^5C_4)=75 .
  • When there is five lady, there is one gentleman in the committee. The ways to form the committee is color(red)((""^6C_1xx""^5C_5)=6 .

The sum of the ways is color(blue)(30+150+200+75+6)=461

That is my answer, I don't know why the option doesn't match.

Mar 16, 2018

461

Explanation:

6 gentlemen, 5 ladies form 6-person committee, which at least

Total number of possible outcomes,

"^11C_6

Total number of unconditioned outcomes (6 gentlemen, 0 lady),

""^6C_6 *"^5C_0

Total number of conditioned outcomes,

""^11C_6-(""^6C_6 *"^5C_0)

Key in your calculator,

461