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3 solutions
2008(20072007)- 2007(20082008) ==> 2008(20072007)- 2008(20082008) +20082008 =2008(20072007-20082008)+20082008 =2008(10001)+20082008 =-20082008+20082008 =0
2 0 0 8 × 2 0 , 0 7 2 , 0 0 7 − 2 0 0 7 × 2 0 , 0 8 2 , 0 0 8 = 2 0 0 8 ( 2 0 , 0 7 0 , 0 0 0 + 2 0 0 7 ) − 2 0 0 7 ( 2 0 , 0 8 0 , 0 0 0 + 2 0 0 8 ) 2 0 0 8 × 2 0 , 0 7 0 , 0 0 0 + 2 0 0 8 × 2 0 0 7 − 2 0 0 7 × 2 0 , 0 8 0 , 0 0 0 − 2 0 0 7 × 2 0 0 8 2 0 0 8 × 2 0 , 0 7 0 , 0 0 0 − 2 0 0 7 × 2 0 , 0 8 0 , 0 0 0 = 1 0 , 0 0 0 ( 2 0 0 8 × 2 0 0 7 − 2 0 0 7 × 2 0 0 8 ) 1 0 , 0 0 0 ( 0 ) = 1 0 , 0 0 0
Sooooooo sorry answer is 0
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U ll are right when u see two of the same nums together u hv to know that it is a multiple of 1 or 11 or 101 or 1001 and so on.If u know this rule u will be able to solve any questions like this
20072007 and 20082008 are multiples of 1001 so 2008x2007x1001-2007x2008x1001 is 0