If 'n' is an even number and f(n) =sum...

If 'n' is an even number and `f(n) =sum_(r=1)^n r^2` such that sum of the series `1^2 + 3^2 +5^2+.....` up to `n/2` terms is equal to `af (n) + bf(n/2)`, then `|a - b|` is equal to

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