Solve the problem.How many seven-digit phone numbers are possible if the first four digits can be 1, 2, 3, or 4 and the other three digits can be any numeral 0-9?
A. 186,624
B. 256,000
C. 640,000
D. 25,600
Answer: B
Mathematics
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and 
A. 
and 
B. 
and 
C. 
and 
D. 
and 
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Bh for h
A. h = 
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C. h = 
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, 
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Mathematics