How to delete photos and contacts my computer added onto my iphone?

I wanted to sync a few songs onto my iphone from my computer and next thing i know, i have tons of new photos and contacts. I can't delete the photos and i can delete the contacts but only one at a time and that would take forever.

Connect it to your computer go to Windows Explorer, click on your iPhone, and in one of the folders there will be all of your pictures just go ahead and delete all of them.

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