The CAS Registry Mumber 42077-25-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,0,7 and 7 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 42077-25: (7*4)+(6*2)+(5*0)+(4*7)+(3*7)+(2*2)+(1*5)=98 98 % 10 = 8 So 42077-25-8 is a valid CAS Registry Number.
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