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What operation is denoted here?

$$11_3$$

I believe the answer to this is 4.

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4
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Base, or radix.

$11_3$ is the number $4$ written in base $3$: $$ 11_3 = 1\cdot 3^1+1\cdot 3^0 = 3+1=4 $$ A small nitpick: it is not technically an operation, but a notation.

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It's not an operation - it's a sign for what base the number is expressed in.

$11_3=4_{10}$.

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