The CAS Registry Mumber 1026734-30-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,6,7,3 and 4 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1026734-30: (9*1)+(8*0)+(7*2)+(6*6)+(5*7)+(4*3)+(3*4)+(2*3)+(1*0)=124 124 % 10 = 4 So 1026734-30-4 is a valid CAS Registry Number.
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