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Brynlee
07-21-2013, 12:09 PM
SAT math probability question

If a and b are two distinct positive integers where a + b = 6. What is the probability that a equals 2?

Thanks!!:):)

Thomas
07-21-2013, 12:18 PM
SAT math probability question


If a and b are two distinct positive integers where a + b = 6. What is the probability that a equals 2?

The possible positive integer pairs for a and b in order to satisfy the equation a + b = 6 are (1,5), (2,4), (4,2), (5,1). The pair (3,3) is omitted, since a and b must be distinct. Therefore the probability of a equals 2 is one out of four, i.e. \frac{1}{4}.

Hope these help!!:):)

Brynlee
07-21-2013, 12:18 PM
Thanks Thomas!!