Using "NOT" in a jquery nth-child formula -

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i'd remove 3rd, 4th, 6th, 7th, 9th, etc th. thought like:

  summaryhead.find('tr:first th:nth-child(!3n+2)').remove;

however doesn't work. tried

summaryhead.find('tr:first th:nth-child(3n+3)').remove(); summaryhead.find('tr:first th:nth-child(3n+4)').remove();

this behaves rather weirdly. there way combine 2 finds?

for clarity want remove of green , red fields in image, there might more or less rooms, each room have 3 fields, , want give first room's field colspan 3 , hide 2 fields (colored red & green here): enter image description here

i'm not sure if there nicer way can this

summaryhead.find('tr:first th').filter(':nth-child(3n+3), :nth-child(3n+4)').remove();

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