SOLUTION: In how many different ways can the 15 questions be arranged if the least challenging and the most challenging questions are given consecutively?

Question 1205710: In how many different ways can the 15 questions be arranged if the least challenging and the most challenging questions are given consecutively?
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

total number of ways is
if the least challenging and the most challenging questions are given consecutively, assume that pair of the least challenging and the most challenging questions as single one and the number of ways to be arranged is

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