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Consider the following pattern. 2^3 -1...

Consider the following pattern.
`2^3 -1^3 = 1 + 2 xx 1 xx 3`
`3^3 - 2^3 = 1 + 3 xx 2 xx 3`
`4^3 - 3^3 = 1 + 4 xx 3 xx 3`
Using the above pattern, find the value of the following.
`7^3 - 6^3`

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