20. How many subsets of (a, b,c, d, e, f,h, i) are there? Show how you determined it. D. Write each of the following in set builder notation. 21. (0, 1, 2,3,4,5,6, 7} 22. (January, February, March,...

Answer questions 20-22 in the image please show the work for question 20. Answer correctly. this question deals with sets and set operations

Extracted text: 20. How many subsets of (a, b,c, d, e, f,h, i) are there? Show how you determined it. D. Write each of the following in set builder notation. 21. (0, 1, 2,3,4,5,6, 7} 22. (January, February, March, April, May}