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1. Write the following sets using the "roster method". That is, write the sets in list form. (a) A = {: is a natural number and x appears in the decimal expansion of (b) B = {x:x is an odd integer smaller than 1} 2. List the next element in each of the following sets. (a) {1,...} (b) (3,3,6,9,15,24,...} 3. Answer either TRUE or FALSE to each of the statements (a) through (d). A = {3,6,9, ..., 96, 99} B = {1,0, 1, 2, 3, 4, 5, 6} (a) 66 € A (b) 0EC. (c) {4}E B (d) CCA. C=0 313 999