The possible outcomes could be:{123,124,125,134,135,145,234,235,245,345} Their sums are as follows respectively:{6,7,8,8,9,10,9,10,11,12}=7 The odd sums are{7,9,11}=3 the probability of the sum being odd is 3/7 b.The number of outcomes are 10 the number of outcomes in which L is 4 are 3 So the probability of L being 4 is 3/10
Replace all occurrences of + − with a single −. A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because 1⋅ −1= −1
