You roll a six sided die. what is the probability of rolling a 1 or 2?

A = number of ways to roll a 1 or a 2
B = number of ways to roll the six-sided die

In this case, 
A = 2 (since there is only one copy of '1' or '2')
B = 6 (because there are 6 sides)

So,
Probability of rolling a 1 or 2 = A/B
Probability of rolling a 1 or 2 = 2/6
Probability of rolling a 1 or 2 = 1/3

1/3
(this is approximately equal to 0.333)

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