Answer
((n(n+1)(n+2)(n+3)(n+4)))/120
Work Step by Step
(■(A@B)) = (A choose B)
(■(5+n-1@5))
= (■(n+4@5))
= (n+4)(n+3)(n+2)(n+1)n(n-1)!/5!(n-1)!
= ((n(n+1)(n+2)(n+3)(n+4)))/120
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