An urn contains 10 balls, numbered from 1 to 10. If 2 balls are selected at random with replacement from the urn, what is the probability that the sum of the 2 numbers on the balls will be even?
Number of even values = 5
Number of odd values = 5
Total number of possibilities = 10*10 (chances of picking 10 at each go)
Even plus even and odd plus odd returns an even value, hence, total number of favorable outcomes = 5*5+5*5/ 100 = 1/2 = 50%
Number of even values = 5
Number of odd values = 5
Total number of possibilities = 10*10 (chances of picking 10 at each go)
Even plus even and odd plus odd returns an even value, hence, total number of favorable outcomes = 5*5+5*5/ 100 = 1/2 = 50%
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