Answer the question.How many 12 letter strings can be formed with the letters D , E , F , and G , if each letter can be used more than once?
A. 16,777,216
B. 16,777,416
C. 16,777,296
D. 16,777,176
Answer: A
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Determine the limit by sketching an appropriate graph. 
A. 4 B. -0 C. Does not exist D. -12
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