Write the first five terms of each sequence. Determine whether each sequence is arithmetic, geometric, or neither.
a. a(1) = 7, a(n) = a(n-1)-3 for n ≥ 2.
b. b(1) = 2, b(n) = 2•b(n-1) - 1 for n ≥ 2.
c. c(1) = 3, c(n) = 10•c(n-1) for n ≥ 2.
d. d(1) = 1, d(n) = n•d(n-1) for n ≥ 2.
