1.

Provethat n! ⋅(n+2)=n! +n+1!

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Step-by-step EXPLANATION:

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022 { { { { \frac{ \frac{ \frac{ \frac{ \frac{ \frac{ \frac{ \frac{ { \frac{ { { { { { { { { { { { { {?}^{2} }^{2} }^{2} }^{2} }^{2} }^{2} }^{2} }^{2} }^{2} }^{2} }^{?} }^{?} }^{?} \times \frac{?}{?} }{?} }^{2} }{?} }{?} }{?} }{?} }{?} }{?} }{?} }{?} \times \frac{?}{?} }^{?} }^{?} }^{?} }^{?} \times \frac{?}{?}


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