Discussion
Find the one which does not belong to that group ?
Answer: B
Three of the four are not divisible by 9.
\[ 630 = 9 \times 70 \quad (\text{digit sum } 6+3+0 = 9) \]
\[ 30 \to 3, \qquad 10 \to 1, \qquad 520 \to 7 \]
Only 630 has a digit sum divisible by 9, so 630 does not belong.
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