18. Verify the property of divisibility of a factor of a number by taking any two numbers.
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(iii) When a number is a factor of two given numbers, it is also a factor of their sum and difference. Also, 6 is a factor of (30 + 18) = 48 since, 48 ÷ 6 = 8. Also, 6 is a factor of (30 - 18) = 12 since, 12 ÷ 6 =2. (iv) When a number is a factor of another number, it is also a factor of any multiple of that number.
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