1.

For the sequence 1, 7, 25, 79, 241, 727 … simple formula for {an} is ____________

A. 3<sup>n+1</sup> – 2
B. 3<sup>n</sup> – 2
C. (-3)<sup>n</sup> + 4
D. n<sup>2</sup> – 2
Answer» C. (-3)<sup>n</sup> + 4


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