The CAS Registry Mumber 557795-10-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,7,7,9 and 5 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 557795-10: (8*5)+(7*5)+(6*7)+(5*7)+(4*9)+(3*5)+(2*1)+(1*0)=205 205 % 10 = 5 So 557795-10-5 is a valid CAS Registry Number.
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