17 x ( 117 - 498) - 117 x ( 17 - 498)
= 17 x 117 - 17 x 498 - 117 x 17 +117 x 498
= ( 17 x 117 - 17 x 117 ) + (117 x 498 - 17 x 498)
= 0 + 498 x ( 117 - 17)
= 498 x 100
= 49800
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