Question 155500
1) each entry is 2 times the previous entry. Geometric
2) each entry is 2 greater than the previous entry. Artimetic
3) each entry is (n+1) times the previous entry. 2 = 1*2, 6 = 2*3, 24 = 6*4. Geometric 
4) each entry is 7 more than the previous entry. Arithmetic