The CAS Registry Mumber 79718-21-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,7,1 and 8 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 79718-21: (7*7)+(6*9)+(5*7)+(4*1)+(3*8)+(2*2)+(1*1)=171 171 % 10 = 1 So 79718-21-1 is a valid CAS Registry Number.
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