‌Let <img src="https://static.zxtiku.com/wangke/imgs/topic/b92b5e188abb57ecc65df7ee875410c4.png"/> follows a Pareto distribution with PDF <img src="https://static.zxtiku.com/wangke/imgs/topic/efd28c4240df880935c11dc90732ce11.png"/>. Then <img src="https://static.zxtiku.com/wangke/imgs/topic/5e6014fba0e06081082aa9e380580670.png"/> when <img src="https://static.zxtiku.com/wangke/imgs/topic/d8478f8184c1022c91bbb5d6631a90b3.png"/>.‎