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  1. If a and b are odd numbers, then which of the following is even ?
    1. a + b + ab
    2. a + b – 1
    3. a + b + 1
    4. a + b + 2ab
Correct Option: D

The sum of two odd numbers is even. The same is the case with their product.
∴  a + b + 2ab = Even number


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