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To find an equivalent expression with positive exponents, we can use the property of exponents that states: a^(-b) = 1/(a^b).
So, applying this property to 13^(-5)*13^(-11), we can rewrite it as:
(1/13^5)*(1/13^11)
Then, using the property of exponents that states: (a^b)*(c^b) = (a*c)^b, we can simplify the expression further:
1/(13^(5+11))
1/(13^16)
Therefore, the answer is option b. (1)/(13^(16)).