Question 1106806
<pre>
{{{P(n,k)=n!/(n-k)!=120}}}

120 = 2×60 = 2×3×20 = 2×3×4×5 = P(5,4) = 1×2×3×4×5 = P(5,5)

Two solutions:

n=5, k=4

n=5, k=5

Edwin</pre>