3. The terms in the sequence 6, 2, -4, -6, -2, 4, ... can be found using which formula? (a) a,= a n-2 -an-1 , a 1 = 6 and a 2 = 2 (c) a,= an-1-an-2 , a 1 = 6 and a 2 = 2 (d) None of the above 4. Is the sequence in Problem 3 arithmetic, geometric, or neither? (a) Arithmetic (b) Geometric (d) Information not enough (c) Neither

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