The CAS Registry Mumber 65742-22-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,7,4 and 2 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 65742-22: (7*6)+(6*5)+(5*7)+(4*4)+(3*2)+(2*2)+(1*2)=135 135 % 10 = 5 So 65742-22-5 is a valid CAS Registry Number.
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