SOLUTION: Use either the fundamental counting principle or the permutation formulas (or both) to answer the following:
How many seven-digit phone numbers can be formed if the first digit
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-> SOLUTION: Use either the fundamental counting principle or the permutation formulas (or both) to answer the following:
How many seven-digit phone numbers can be formed if the first digit
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Question 146038: Use either the fundamental counting principle or the permutation formulas (or both) to answer the following:
How many seven-digit phone numbers can be formed if the first digit cannot be 0 and
a.) repetition of digits is not permitted?
b.) if repetition of digits is permitted?
You can put this solution on YOUR website! How many seven-digit phone numbers can be formed if the first digit cannot be 0 and
a.) repetition of digits is not permitted?
9*9*8*7*6*5*4=9*(9!/3!)
b.) if repetition of digits is permitted?
9*10*10*10*10*10*10=9*10^6
