3. (6 points) Using one each of 1 jiao, 2 jiao, 5 jiao, 1 yuan, 2 yuan, and 5 yuan, you can form $\qquad$ different denominations.
【Answer】Solution: 1 jiao, 2 jiao, 5 jiao, 1 yuan, 2 yuan, 5 yuan, each one is 6 different denominations $C_{6}^{1}+C_{6}^{2}+C_{6}^{3}+C_{6}^{4}+C_{6}^{5}+C_{6}^{6}=6+15+20+15+6+1=63$ (types), Answer: 63 different denominations can be formed.

Therefore, the answer is: 63.