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karishma B and @Bunnel

I did it like selecting 3 teams that can be formed out of 5 =>5C3 =10

Now considering the non possible options :
1. Paul Sturat Case: other1 can be chosedn in 3 ways hence =3 ways( P,S, Jane: P,S,Jone : P,S, Jessica )
2. Jane Paul Case: other one can be selected in 2 ways (considering overlap ) (Jane ,Paul, Jessica: Jane, Paul, Jone )

which gives 5 possible ways of not selecting
Ultimately giving us 5 ways of selection.

I would really request your advise on where i am missing out!!!
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MuditKapoor
karishma B and @Bunnel

I did it like selecting 3 teams that can be formed out of 5 =>5C3 =10

Now considering the non possible options :
1. Paul Sturat Case: other1 can be chosedn in 3 ways hence =3 ways( P,S, Jane: P,S,Jone : P,S, Jessica )
2. Jane Paul Case: other one can be selected in 2 ways (considering overlap ) (Jane ,Paul, Jessica: Jane, Paul, Jone )

which gives 5 possible ways of not selecting
Ultimately giving us 5 ways of selection.

I would really request your advise on where i am missing out!!!
You flipped Jane’s restriction. Jane refuses to be on the committee without Paul, so the invalid case is Jane without Paul, not Jane with Paul.

So your second bucket should be 3 invalid committees, not 2: Jane + Joan + Stuart, Jane + Joan + Jessica, and Jane + Stuart + Jessica. Then total invalid = 3 + 3 = 6, so valid = 10 - 6 = 4.

All invalid committees are these 6:
Paul, Stuart, Jane
Paul, Stuart, Joan
Paul, Stuart, Jessica

Jane, Joan, Stuart
Jane, Joan, Jessica
Jane, Stuart, Jessica

The first 3 are invalid because Paul and Stuart refuse to serve together. The last 3 are invalid because Jane refuses to be on the committee without Paul.
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Ohh yes!!
Seems i mistook the line.
Thanks for help @Bunnel
Bunuel

You flipped Jane’s restriction. Jane refuses to be on the committee without Paul, so the invalid case is Jane without Paul, not Jane with Paul.

So your second bucket should be 3 invalid committees, not 2: Jane + Joan + Stuart, Jane + Joan + Jessica, and Jane + Stuart + Jessica. Then total invalid = 3 + 3 = 6, so valid = 10 - 6 = 4.

All invalid committees are these 6:
Paul, Stuart, Jane
Paul, Stuart, Joan
Paul, Stuart, Jessica

Jane, Joan, Stuart
Jane, Joan, Jessica
Jane, Stuart, Jessica

The first 3 are invalid because Paul and Stuart refuse to serve together. The last 3 are invalid because Jane refuses to be on the committee without Paul.
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I did not use calculation- basic counting - I came up with 4 such committees - JA, P, JE - JA, P, JO- JA ,JE, JO - JO,S, JE. We cannot make more without breaching the restrictions. Hence 4 is the answer.
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