(n+2)!/(n+1)!
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(n+2)!/(n+1)!(n+2)!/(n+1)!(n+2)!/(n+1)!(n+2)!/(n+1)!=[1×2×3×……×(n+2)]/[1×2×3×……×(n+1)]=n+2二恶英提供
(n+2)!/(n+1)!
(n+2)!/(n+1)!
(n+2)!/(n+1)!
(n+2)!/(n+1)!
=[1×2×3×……×(n+2)]/[1×2×3×……×(n+1)]
=n+2
二恶英提供
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