problem in installing packages like dplr in rstudio

Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.6:
cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.6/PACKAGES'

This seems a connectivity issue, is your internet connection behind a proxy server or firewall? That is usually the case when you are at work or school.

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I have tried using multiple networks but no use

Do you have a proxy or something ?
Can you download a file from internet in your R Session ?

I am with @andresrcs on this one. This usually comes from a connectivity issue between R and the web from your environment.

A couple of things to try

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