The CAS Registry Mumber 77870-37-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,8,7 and 0 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 77870-37: (7*7)+(6*7)+(5*8)+(4*7)+(3*0)+(2*3)+(1*7)=172 172 % 10 = 2 So 77870-37-2 is a valid CAS Registry Number.
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