Find a formula for the nth term of the sequence.The sequence 0, 0, 2, 2, 0, 0, 2, 2, . . . (alternating 0's and 2's in pairs)
A. an = 1 - (-1)n(n-1)
B. an = 1 + (-1)n(n-1)
C. an = 1 + (-1)n(n+1)
D. an = 1 + (-1)(n(n+1))/2
Answer: D
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A. 
B. 
C. 
D. 
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