2009 · Q97
Consider the following statements: A number a l a 2 a 3 a 4 a 5 is divisible by 9 if a 1 + a 2 + a 3 + a 4 + a 5 is divisible by 9. a 1 – a 2 + a 3 – a 4 + a 5 is divisible by 9. Which of the above statements is/are correct?
Elementary MathematicsNumber System
- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1nor2
Explanation
Divisibility by 9 depends on digit sum; statement 1 only is correct.