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There are many benefits to timing your practice, including:
If you roll a die 3 times , and if u are only looking for even and odd (i.e. 2 outcomes) then the number of results is 2^3 = 8. Out of which the only times its NOT a valid result is 3 evens or 3 odds. So if u remove these two results the probability is 6/8 = 3/4.