The CAS Registry Mumber 856602-30-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,5,6,6,0 and 2 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 856602-30: (8*8)+(7*5)+(6*6)+(5*6)+(4*0)+(3*2)+(2*3)+(1*0)=177 177 % 10 = 7 So 856602-30-7 is a valid CAS Registry Number.
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