In a city where all streets run east-to-west, all avenues run north-to-south, and all intersections are right angles as

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In a city where all streets run east-to-west, all avenues run north-to-south, and all intersections are right angles as shown below, Jenn needs to walk from the corner of 1st Street and 1st Avenue to the corner of 6th Street and 3rd Avenue. If her friend Amanda is sitting on a bench on 4th Street halfway between 1st and 2nd Avenues, and Jenn chooses her path randomly from any route that will allow her to walk exactly seven blocks to her destination, what is the probability that Jenn will walk down 4th St. past Amanda?

A. \(\dfrac1{42}\)

B. \(\dfrac1{21}\)

C. \(\dfrac17\)

D. \(\dfrac13\)

E. \(\dfrac12\)

Answer: C

Source: Veritas Prep