The CAS Registry Mumber 79331-54-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,3,3 and 1 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 79331-54: (7*7)+(6*9)+(5*3)+(4*3)+(3*1)+(2*5)+(1*4)=147 147 % 10 = 7 So 79331-54-7 is a valid CAS Registry Number.
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