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Question

Prove that:
∣ ∣131619141720151821∣ ∣=0

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Solution

To prove: ∣ ∣131619141720151821∣ ∣=0
It can be expanded as ∣ ∣131619141720151821∣ ∣=13(17×2118×20)16(14×2115×20)+19(14×1815×17)
=13(357360)16(294300)+19(252255)
=13(3)16(6)+19(3)
=39+9657
=96+96
Therefore, ∣ ∣131619141720151821∣ ∣=0

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