Let fn be the nth Fibonacci number. Recall that fn = fn-1 + fn-2; fo = 0, f₁ = 1. Prove that for all n ≥ 1, n Σf} = fnfn

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answerhappygod
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Let fn be the nth Fibonacci number. Recall that fn = fn-1 + fn-2; fo = 0, f₁ = 1. Prove that for all n ≥ 1, n Σf} = fnfn

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Let fn be the nth Fibonacci number. Recall that fn = fn-1 + fn-2; fo = 0, f₁ = 1. Prove that for all n ≥ 1, n Σf} = fnfn+1 i=1 For all positive integers n, show that 4 + 8 + 12 + ... + 4n = 2n² + 2n.
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