Discussion
Which of the following numbers is not divisible by 18?
Answer: D
A number is divisible by 18 if it is divisible by its co-prime factors, 2 and 9.
Option D, 65043, ends in 3, so it is an odd number and not divisible by 2. Therefore, it cannot be divisible by 18.
Let's check the others to be sure. A) 34056: Ends in 6 (div by 2). Sum is 18 (div by 9). So divisible by 18. B) 54036: Ends in 6 (div by 2). Sum is 18 (div by 9). So divisible by 18. C) 50436: Ends in 6 (div by 2). Sum is 18 (div by 9). So divisible by 18.
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