Answer:
- 2
Explanation:
Using the term to term rule of subtract 5, then
a(2) = a(1) - 5 = 13 - 5 = 8
a(3) = a(2) - 5 = 8 - 5 = 3
a(4) = a(3) - 5 = 3 - 5 = - 2
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