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    What type of battery to buy for dell laptop..?

    Hello, I have a dell inspirion model number m5010 laptop I bought recently. The battery I bought only lasts for about 45 minutes or so. I was hoping to buy a battery I could connect on here for it so it lasts about 4 hours plus. Does anyone know which exact battery I could buy that could fit my...
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    Problems with laptop connecting to hdmi television?

    Hi, I had bought a laptop recently that plays movies from my computer to the television easily with the hdmi wire. The only problem is it plays the movies while the computer is on a duplicate screen, meaning playing the laptop and the television at the same time. I only want the television to...
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    is set {a} an element of {a,b}?

    Are both of these statements true I can't remember the difference?? Is {a} an element of {a,b} is "a" an element of {a,b} I dont remember if both are true or one is false. thanks
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