<div>
    <h1>h1タグ</h1>
    <p>1番目のPタグ</p>
    <p class="ex">2番目のPタグ∧1番目のex</p>
    <p class="ex">3番目のPタグ∧2番目のex</p>
    <p class="ex">4番目のPタグ∧3番目のex</p>
</div>
div .ex:nth-of-type(2){
	color: red;
}
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