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Consider 10 digits numbers of the form M...

Consider 10 digits numbers of the form `M sum_(r=0)^9 a_r 10^r,`where `a_r,r=0,1,2,.....9` are r=0 distinct digits, `a_9 != 0,` which are divisible by 99999. If N is the number of such numbers, then the last digit of N is

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