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  4. Hace 14 horas · Prove the formula for n=k+1. We need to show that: ∑ k = 1 k + 1 k 2 = ( k + 1) ( k + 2) ( 2 ( k + 1) + 1) 6 This can be done by adding (k+1)^2 to both sides of the equation assumed in Step 4 and simplifying. After proving the formula for n=k+1, we can conclude that the formula is true for all natural numbers n by the principle of ...