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P - Q = (201520152015 x 2016201620162016) - (201620162016 - 2015201520152015)
ingat :
(111 x 2222) - (222 x 1111) = 0
(222 x 3333) - (333 x 2222) = 0
begitu juga dengan 2015 dan 2016 dengan digit yang berulang.
sehingga :
2016 x (P - Q) = 2016 x 0
= 0
Q=2015201520152015 x 201620162016 = ( 2015 x 1000100010001 ) x ( 2016 x 10001001 )
P - Q = 1 - 1
P - Q = 0
maka
2016 x ( P - Q )
= 2016 x ( 1 - 1 )
= 2016 x 0
= 0