The CAS Registry Mumber 79902-57-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,9,0 and 2 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 79902-57: (7*7)+(6*9)+(5*9)+(4*0)+(3*2)+(2*5)+(1*7)=171 171 % 10 = 1 So 79902-57-1 is a valid CAS Registry Number.
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