Question

If the product of two whole numbers is zero, can we say that one or both of them will be zero? Justify through examples.

Easy
Solution
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Step 1: To justify
(1) If the product of two whole numbers is zero, then one or both of them will be zero.

Step 2: Justification 
If the product of whole numbers is zero, then one of them is definitely zero. For example, and

Now, If the product of whole numbers is zero, then both of them may be zero. For example,

However, Since the numbers to be multiplied are not equal to zero, therefore, the result of the product will also be non-zero.

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