The CAS Registry Mumber 507-84-6 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,0 and 7 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 507-84: (5*5)+(4*0)+(3*7)+(2*8)+(1*4)=66 66 % 10 = 6 So 507-84-6 is a valid CAS Registry Number.
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