Essay
How many seven-digit telephone numbers are possible if the first digit must be nonzero?
__________
How many international direct-dialing numbers are possible if each number consists of a four-digit area code (the first digit of which must be nonzero) and a number of the type described in part (a)?
__________
Correct Answer:

Verified
Correct Answer:
Verified
Q172: If <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6027/.jpg" alt="If ,
Q173: In a survey of 380 households regarding
Q174: In a survey conducted by a union,
Q175: Use venn daigram to illustrate the statement.
Q176: The 120 consumers were asked about their
Q178: In a poll conducted among <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6027/.jpg"
Q179: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6027/.jpg" alt="Let .
Q180: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6027/.jpg" alt=" "
Q181: A survey of 100 college students who
Q182: Let <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6027/.jpg" alt="Let .