Write out the sum. Do not evaluate.
A. 2 + 22 + 23 + ... + 2n+1
B. 22 + 23 + 24 + ... + 2n
C. 22 + 23 + 24 + ... + 2n+1
D. 2 + 22 + 23 + ... + 2n
Answer: C
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