Determine whether the following is a recursive or explicit. Then, find the first four terms of the following sequence.

Question

a) a_n = 〖na〗_(n-1) where a_0 =5

b) a_n = a_(n-1) + 3a_(n-2) where a_0 = 1 and a_1 =2

c) a_n = 2^n + 5•3^n for n=0,1,2,3

Answer 1

if a_n depends on previous values of the sequence, then it is recursively defined.