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In a plan for area​ codes, the first digit could be any number from 44 through 99​, the second digit was either 0 or 44​, and the third digit could be any number except 0.
With this​ plan, how many different area codes were​ possible?

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Answer:

In a different plan for area codes a number can be any digit from 1-7 the second number was either 4,5,6,7 and the third digit can be any number except 6-8.With this plan how many different area codes are possible?

1st digit:: 7 ways

2nd digit:: 4 ways

3rd digit:: 7 ways

 

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Ans: 7*4*7 = 196

Step-by-step explanation:

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