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a)There are 4 subway lines from city T to city Y and 3 subway lines from city Y to city R. Which of thefollowing options

a)There are 4 subway lines from city T to city Y and 3 subway lines from city Y to city R. Which of thefollowing options is the number of ways that a person can have a round-trip fromTtoRviaY? choose the right answer (12 , 24, 16, 7, 144)

b)There are 4 subway lines from city P to city Y and 3 subway lines from city Y to city R. Which of thefollowing options is the number of ways that a person can have a round-trip fromPtoRviaYwithoutusing each subway line more than once? choose the right answer (108, 12, 14, 144, 72)

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