Bunuel wrote:

The number k is a three-digit positive integer that has A as its hundreds’ digit, B as its tens’ digit, and C as its units’ digit. If none of the three digits is 0, what is the value of 2k?

(1) A = 3B = 9C

(2) A/B = B/C

(1) tells us that C can only take 1, hence b will be 3 and A will be 9

ABC = 931 = k

2k = 2*931 = 1862

Sufficient

(2) A,B,C can take (1,2,4), (1,3,9) and (2,4,8) and hence no unique value of k

Not sufficient

hence A

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