The CAS Registry Mumber 173762-81-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,7,6 and 2 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 173762-81: (8*1)+(7*7)+(6*3)+(5*7)+(4*6)+(3*2)+(2*8)+(1*1)=157 157 % 10 = 7 So 173762-81-7 is a valid CAS Registry Number.
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