A recursion formula and the initial term(s) of a sequence are given. Write out the first five terms of the sequence.
-$$a _ { 1 } = 1 , a _ { 2 } = 2 , a _ { n + 2 } = a _ { n + 1 } - a _ { n }$$
A) 1, -2, 3, -4, 5
B) 1, -1, 2, -3, 5
C) 1, 2, 1, 0, -1
D) 1, 2, 1, -1, -2

Question

Quizplus · Accepted Answer

The Answer is D

A Recursion Formula and the Initial Term(s) of a Sequence a1=1,a2=2,an+2=an+1−ana _ { 1 } = 1 , a _ { 2 } = 2 , a _ { n + 2 } = a _ { n + 1 } - a _ { n }a1​=1,a2​=2,an+2​=an+1​−an​

A Recursion Formula and the Initial Term(s) of a Sequence $a _ { 1 } = 1 , a _ { 2 } = 2 , a _ { n + 2 } = a _ { n + 1 } - a _ { n }$