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Question 3  (i)

Using divisibility test, determine whether the given number is divisible by 6:

639210


Solution

Divisibility rule for 6: If a number is divisible by 2 and 3 both then it is divisible by 6 also.

Applying the above divisibility rule, we get
639210    Divisible by 2 as its units place is an even number.
639210  Divisible by 3 as the sum of its digits (= 21) is divisible by 3.

Since the number is divisible by both 2 and 3, therefore, it is divisible by 6.

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