How Many Seven-Digit Telephone Numbers Are Possible If the First

question 177

Essay

How many seven-digit telephone numbers are possible if the first digit must be nonzero?
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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)?
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Definitions:

Sociometric Status

Sociometric status refers to a measurement of social standing within a group, based on the extent to which individuals are liked or accepted by their peers.

Aggressive

Behaving in a hostile or violent manner that is intended to dominate or intimidate another individual.

Joking

The action of telling jokes or engaging in humorous conversation to amuse others.

Cooperative Strategies

Approaches and tactics employed by individuals, groups, or nations to work together towards common goals, emphasizing mutual benefits.