Question: Given the following equation, prove that the left side is equal to the right side (i.e., LS = RS) n P 2 + n+1 P

Given the following equation, prove that the left side is equal to the right side (i.e., LS = RS)

nP2 + n+1P2 = 2n2

(or equivalently:P(n, 2) + P(n+1, 2) = 2n2 )

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