A 68 year old retiree has a pension savings of $40,000, a 401k of $63,000, and an IRA account of $59,000. Before 2008, he had 2%
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Both numerator and denominator are a sum of 51 terms, counted skipping 4s (numerator) and 2s (numerator).
So, you have
Use the linearity of sum to rewrite this as
So, as you can see, the numerator is exactly twice the numerator: you can cancel out the sum and you have