Yes.
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If two dice are rolled, the probability that the sum of observed values is equal to 13 is zero. The sum of two dice can only lie between 2 and 12, inclusive.
It depends on what the numbers on all the balls are.
With standard dice, zero.
False; the "or" is an additive property so the probability of rain or snow muse be greater than or equal to 0.65.
The sum of the absolute values of two numbers is greater or equal than the absolute values of the sum. It will be equal if both are positive or both are negative; greater if one is positive and one is negative. Try it out with some sample numbers!