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Geometry Level 1

In the figure, let

$a = \dfrac{PS\cdot QB\cdot RT}{BR\cdot TP\cdot SQ},\quad b =\dfrac{ZV\cdot YW\cdot XC}{WZ\cdot VX\cdot CY}.$

What is the value of $a-b?$

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by Siddharth Singh

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