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Remember Fermat?

Number Theory Level 3

If $x={ 2 }^{ 20 }+{ 3 }^{ 30 }+{ 4 }^{ 40 }+{ 5 }^{ 50 }+{ 6 }^{ 60 }$ , find $x \text{ mod } 7$ .

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by Swapnil Das

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