The CAS Registry Mumber 215022-92-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,5,0,2 and 2 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 215022-92: (8*2)+(7*1)+(6*5)+(5*0)+(4*2)+(3*2)+(2*9)+(1*2)=87 87 % 10 = 7 So 215022-92-7 is a valid CAS Registry Number.
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