How to remove left and right margin on first and last div

Tags: css,css3

Problem :

I have more than 100 divs on the page and each row has 3 divs. I want to remove left margin from first div and right margin from right div whereas center div should have 15px margin from left and right. Please guide me how can I do that without giving specific classes (no margin) on each div. Here is the example

enter image description here here is my css code

    margin:15px 15px;

Solution :

Check this out :

Use nth-child(n) CSS3 selector.

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