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325 = 847288609443. The last digit is therefore "3".

On your calculator (if you have a scientific calculator; and if you don't but you are using Microsoft Windows you can get a scientific calculator up by going to Start and typing in "calc" in the run/search box) you will have a button that looks like this:

xy (i.e. x to the power of y)

If you type in "3" then press this button and then put in "25" and press equals you should get the above number!

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Q: What is the last digit of 3 to the power of 25?
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