document.write( "Question 1089626: You roll two six-sided dice. What is the probability that the sum is odd or a multiple of 5? Round the answer to the nearest tenth of a percent. \n" ); document.write( "
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You roll two six-sided dice. What is the probability that the sum is odd or a multiple of 5? Round the answer to the nearest tenth of a percent.\r
\n" ); document.write( "\n" ); document.write( "Solution:
\n" ); document.write( "Let A = event that the sum is odd
\n" ); document.write( "B = event that the sum is a multiple of 5
\n" ); document.write( "A = {(1,2), (1,4), (1,6), (2, 1), (2,3), (2,5), (3,2), (3,4), (3,6), (4,1), (4,3), (4,5), (5,2), (5,4), (5,6), (6,1), (6,3), (6,5)}
\n" ); document.write( "There are 18 elements in set A\r
\n" ); document.write( "\n" ); document.write( "B = {(1,4), (2,3), (3,2), (4,1), (4,6), (5,5), (6,4)}\r
\n" ); document.write( "\n" ); document.write( "There are 7 elements in set B\r
\n" ); document.write( "\n" ); document.write( "A AND B = {(1,4), (2,3), (3,2), (4,1)}
\n" ); document.write( "There are 4 elements in set A AND B (intersection)\r
\n" ); document.write( "\n" ); document.write( "Since there are \"6%5E2\" = 36 possible outcomes when two six-sided dice are rolled, then P(A) = 18/36, P(B) = 7/36, and P(A and B) = 4/36.\r
\n" ); document.write( "\n" ); document.write( "P(A OR B) = P(A) + P(B) - P(A and B)
\n" ); document.write( " = (18/36) + (7/36) - (4/36) = 21/36 or \"highlight%2858.3%29\" percent
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