A Recursion Formula and the Initial Term(s) of a Sequence $$a _ { 1 } = 1 , a _ { 2 } = 3 , a _ { n + 2 } = a _ { n + 1 } - a _ { n }$$

question 85

Multiple Choice

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

• A) \(1,3,2,1,0\)
• B) \(1 , - 1,2 , - 3,5\)
• C) \(1,3,2 , - 1 , - 3\)
• D) \(1 , - 3,4 , - 5,6\)

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