css nth-child selector formula -

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i have list of html items , need select every 3 on 3. (1,2,3,7,8,9,13,14,15 e.t.c)

please suggest me, possible using css nth-child selector , formula should in parentheses? or way javascript?

hooray! i've found solution! answers! version is:

.item:nth-child(1+6n), .item:nth-child(2+6n), .item:nth-child(3+6n) {    /* styles */ }

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