Dice probability with 2 dice

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I am needing an answer put in very simple terms so I can then explain to my son hiw to get to said answer!! The question ;What is the probability of rolling a double six if you threw 2 dice 60 times? Im not bothered about 'fair' dice etc, just normal 6 sided dice! I get that there are 36 possible outcomes per roll of two dice. So over 60 rolls there is 2160 possible outcomes. The question is written in the test just as I have written it above. It doesnt allude to simplfying or converting to percentages etc. All the help you can give would be fantastic thanks

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Probability of this question = $1/36+1/36*35/36+1/36*35/6*35/36+...........+1/36*{35/36}^{59} =1/36 \frac{1-\frac{35}{36}^{60}}{1/36} =1-\frac{35}{36}^{60}$