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Which of the following number is not divisible by 18?

(1) 54036 (2) 50436

(3) 34056 (4) 65043

Solution:

(4) A number will be exactly divisible by 18 if it is divisible by 2 and 9 both.
Clearly 65043 is not divisible by 2.
= Required number = 65043

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