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Fill the blank with the least digit so that 6_8 is a multiple of 3.

A1
B2
C0
D3
Answer & Solution
Correct answer: A. 1
6 + 8 = 14, and 14 + 1 = 15 is a multiple of 3, while 0, 2 and 3 give 14, 16 and 17.
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