Answer or Solution : 1. This puzzle picture "Use only three 9's and make 1" shows you the puzzle of deriving 1, by using only 3 nines and math expressions other than '/' and '*'.

2. We know that anything to the power of '0' is 1.

3. Hence 9^0 would be one.

4. Since we need to use three 9s, we can use as 9^(9-9), which derives to 9^0 = 1.