The CAS Registry Mumber 88077-74-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,8,0,7 and 7 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 88077-74: (7*8)+(6*8)+(5*0)+(4*7)+(3*7)+(2*7)+(1*4)=171 171 % 10 = 1 So 88077-74-1 is a valid CAS Registry Number.
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