R studio homework help!

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Hi all, In R studio, what code do i need to conduct:

step 1: I roll 3 six-side dice once and repeat it 100 times，and store the results into a row=100/column=3 matrix.

step 2: sum the rows (one row should be the sum of 3 dice' count), so i would have 100 results.

step 3: In these 100 trails, what is the probability that the sum count in in one row is >=13?

thanks a lot

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