css selectors - How to select only some children in CSS? -

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i have divs in html, dynamic number of divs

how select divs 2,5,8,11 ?

i tried :nth-child(2n+3) not need

here's code:

<!doctype html> <html>   <head>       <style>           .a:nth-child(2n+3) { background:#ff0000; }       </style>   </head>   <body>     <p class="a">the first paragraph.</p>     <p class="a">the second paragraph.</p>     <p class="a">the third paragraph.</p>     <p class="a">the fourth paragraph.</p>     <p class="a">the fifth paragraph.</p>     <p class="a">the sixth paragraph.</p>     <p class="a">the seventh paragraph.</p>     <p class="a">the 8 paragraph.</p>     <p class="a">the ninth paragraph.</p>     <p class="a">the seventh paragraph.</p>     <p class="a">the 8 paragraph.</p>     <p class="a">the ninth paragraph.</p>   </body> </html>

edit if 2,5,8,11 needed answer be:

p:nth-child(3n+2) {    background: #ccc; }

select paragraphs 2, 3, 5, 8, 11:

p:nth-child(3n+2),p:nth-child(3) {    background: #ccc; }

fiddle

i had add p:nth-child(3) separately because doesn't fit in general pattern of +3 each time.


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