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There might be more than one answer but I came up with this;

8x8x8= 512

8x8x8= 512

8+8+8=24

So if you add the first two numbers (512 twice) that makes 1024.

Then you simply minus the last number which is 24 and it equals 1000.

The total number of 8's also equal 9.

Enjoy :]

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Unfortunately the first answer I gave used 9 8's whilst you were only allowed 8 of the chosen digit.

Here's my second attempt;

If you add two 5's together it equals 10

Do this two more times.

So you have three 10's.

Now simply times these together.

So that's: (5+5)(5+5)(5+5)= 1000

There you go finally and I only used the digits 6 times! ;D

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Hi,

And the correct answer is

(8*8+8*8)*8-(8+8+8)

Here one digit is used exactly eight times

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