pre-calculus

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Prove 3+4+5+...+(n+2) = [n(n+5)]/2 for n>4
Do the first step in a proof by induction.

  • pre-calculus -

    You must have a typo

    in 3+4+5+ ... + (n+2)

    the general term does not match your first three numbers

  • pre-calculus -

    I'm not sure. It was on my math test. I typed it out exactly like it said on the test.

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