The CAS Registry Mumber 887978-32-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,7,9,7 and 8 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 887978-32: (8*8)+(7*8)+(6*7)+(5*9)+(4*7)+(3*8)+(2*3)+(1*2)=267 267 % 10 = 7 So 887978-32-7 is a valid CAS Registry Number.
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