WRITE the first five terms for each sequence. THEN determine whether each sequence is arithmetic, geometric, or neither. 1. a(1)=7, a(n)=a(n-1)-3 for n_> 2.
2.b(1)=2,b(n)=2•b(n-1)-1 for n _>2.
3.c(1)=3,c(n)=10•c(n-1) for n_>2.
4.d(1)=1,d(n)=n•d(n-1) for _>2.