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Indices, SM-Bank 051 MC

Which of the following numbers is not divisible by \(9\)?

  1. 234
  2. 1845
  3. 506
  4. 126
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\(C\)

Show Worked Solution

\(\text{A number is divisible by }9\ \text{if the sum of the digits is divisible by }9.\)

\(\text{Option A:}\rightarrow\) \(\ 2+3+4=9\ \checkmark\)
\(\text{Option B:}\rightarrow\) \(\ 1+8+4+5=18\ \checkmark\)
\(\text{Option C:}\rightarrow\) \(\ 5+0+6=11\ -\text{not divisible by }9\)
\(\text{Option D:}\rightarrow\) \(\ 1+2+6=9\ \checkmark\)

 
\(\Rightarrow C\)