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Option 3 : Both I and II
Let’s understand it with example,
Suppose we have 3 odd numbers - 3,5 and 7
If we add any two of the, we get an even number
3 + 5 = 8
3 + 7 = 10
5 + 7 = 12
And if we add all three of them we get an odd number
3 + 5 + 7 = 15
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