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The average of odd numbers up to 100 is:

1. 49
2. 49.5
3. 50
4. 50.5

Correct answer: 50

Solution

The odd numbers up to 100 are 1, 3, 5, ..., 99. This is an arithmetic progression, so its average is the midpoint of the first and last terms: \((1+99)/2=50\).

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