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Answer :

Step-by-step explanation:

[tex] = {3}^{0} \times {3}^{ - 3} [/tex]

[tex] = 1 \times \frac{1}{ {3}^{3} } [/tex]

[tex] = \frac{1}{3 \times 3 \times 3} [/tex]

[tex] = \frac{1}{27} [/tex]