The CAS Registry Mumber 65164-27-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,1,6 and 4 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 65164-27: (7*6)+(6*5)+(5*1)+(4*6)+(3*4)+(2*2)+(1*7)=124 124 % 10 = 4 So 65164-27-4 is a valid CAS Registry Number.
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