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If $a_1, a_2, \cdots a_{4001}$ are in Arithmetic Progression

and $\frac{1}{a_1 a_2} + \frac{1}{a_2 a_3} + \cdots + \frac{1}{a_{4000} a_{4001}} = 10$

and $a_2 + a_{4000} = 50$

Evaluate $| a_1 - a_{4001} |$

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