Math

A student asks whats wrong with the argument that the probability of rolling a double 6 in two rolls of a die is 1/3 because 1/6+1/6= 1/3? How do I explain the misconception?
I am thinking since there are six sides and they want to roll double 6's in two rolls, the odds are not going to be 1/3?
can anyone help me explain this better?

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