A) 4
B) 5
C) 6
D) 8
E) None of these
Correct Answer: B
Solution :
Routs can be counted as: \[A\to 1\to 4\to B,\]\[A\to 1\to 5\to B,\]\[A\to 2\to \]\[5\to B,\]\[A\to 3\to 5\to B\]and\[A\to 3\to 4\to B\] Hence reqd number of routes is 5.
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