Posted by maria on Thursday, November 24, 2011 at 6:55am.
Select numbers a and b between 0 and 1
independently and at random, and let c be their sum. Let A, B, and C be the results when a, b, and c, respectively, are rounded to the nearest integer. What is the probability that A + B = C?

Probability Pþease helpp  Reiny, Thursday, November 24, 2011 at 10:58am
If a and b are decimals between 0 and 1, then
A and B could be either 0 or 1
The prob of a rounded up to 1 is 1/2 and
the prob of a becoming 0 is 1/2
forming a table:
A B C
0 0  0 e.g. .2+.1 = .3 > 0
0 0  1 e.g. .4 + .4 = .8 > 1 ...... FALSE
0 1  1 e.g. .4 + .9 = 1.3 > 1
1 0  1 e.g. .9+.4 = 1.3 > 1
1 1  1 e.g. .6 + .6 = 1.2 > 1 ... FALSE
1 1  2 e.g. .9+.9 = 1.8 > 2
I see 4 cases out of the 6 where A+B = C
so prob = 4/6 = 2/3
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