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Question Number 214050 by CrispyXYZ last updated on 25/Nov/24

If A: a_1 , a_2 , ..., a_(62)  and B: b_1 , b_2 , ..., b_(62)  are two  strictly increasing natural number sequences  such that a_(62) ≤755 and b_(62) ≤755.  Find the maximum of Σ_(i=1) ^(62) ∣a_i −b_i ∣−∣Σ_(i=1) ^(62) (a_i −b_i )∣.

$$\mathrm{If}\:{A}:\:{a}_{\mathrm{1}} ,\:{a}_{\mathrm{2}} ,\:...,\:{a}_{\mathrm{62}} \:\mathrm{and}\:{B}:\:{b}_{\mathrm{1}} ,\:{b}_{\mathrm{2}} ,\:...,\:{b}_{\mathrm{62}} \:\mathrm{are}\:\mathrm{two} \\ $$$$\mathrm{strictly}\:\mathrm{increasing}\:\mathrm{natural}\:\mathrm{number}\:\mathrm{sequences} \\ $$$$\mathrm{such}\:\mathrm{that}\:{a}_{\mathrm{62}} \leqslant\mathrm{755}\:\mathrm{and}\:{b}_{\mathrm{62}} \leqslant\mathrm{755}. \\ $$$$\mathrm{Find}\:\mathrm{the}\:\mathrm{maximum}\:\mathrm{of}\:\underset{{i}=\mathrm{1}} {\overset{\mathrm{62}} {\sum}}\mid{a}_{{i}} −{b}_{{i}} \mid−\mid\underset{{i}=\mathrm{1}} {\overset{\mathrm{62}} {\sum}}\left({a}_{{i}} −{b}_{{i}} \right)\mid. \\ $$

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