Question

How many different telephone numbers (### - ####) are possible
in an area code if the phone number cannot start with 0 or 1?
Answer using commas as necessary.

Answer #1

The telephone number which you mentioned is a 7 digit telephone number.

Since the first digit is not allowed to be 0 and 1 so there are 8 possibilities for the first digit and those possibilities are : number 2 to number 9

Now, the remaining 6 digits have no restriction so the number of possibilities for the remaining 6 digits are 10 possibilities which are: number 0 to number 9

So the total possible telephone numbers in an area code where the phone number cannot start with 0 and 1 are 8*10*10*10*10*10*10 = 8,000,000

So the answer is 8,000,000

How many different phone numbers are possible in the area code
503, if the first number cannot start with a 0 or 1? Do not use
commas in your answer. Answer:

Kathy just discovered that the telephone company just instituted
a new area code for certain districts in Idaho. She also found out
that area codes and local numbers cannot begin with 0 or 1. How
many different telephone numbers are possible? (Include the area
code as part of the phone number.)

1. Local phone numbers consist of seven numerals, the first
three of which are common to many users.
Until 1996 all toll-free numbers started with the area code 800.
Assume that all digits for the rest of a number were possible, and
determine how many toll-free 800 numbers there were?

The older local seven-digit telephone numbers in Long Beach
started with 439 as the first three digits. How many different
telephone numbers were possible back then starting with 439?

Imagine that you need to create a
passcode that consists of 6 numbers. How many different
pin codes can you create if:
There are no restrictions?
None of the numbers can repeat?
None of the digits can be even?
The first digit cannot be a 0 or 2 and the last digit cannot be
a 0 or 1?
The first digit cannot be 5 and none of the digits can
repeat?

How many possible 5 digit numbers can be formed with the 10
digits 0 to 9 if repetitions are not allowed and zero cannot be the
first digit?

Subjects for the next presidential election poll are contacted
using telephone numbers in which the last four digits are randomly
selected (with replacement). Find the probability that for one
such phone number, the last four digits include at least one 0.
The probability is ??????

The access code for a home security system includes of
six numbers and the 1st # is not
thirty three
and the last number is odd. How many different codes are there?
Also, 0 will be thought of as an even number.
The number of different codes available is what
I need help understanding how to do this problem etc.
Thanks.

Subjects for the next presidential election poll are contacted
using telephone numbers in which the last four digits are randomly
selected (with replacement). Find the probability that for one
such phone number, the last four digits include at least one
0.
The probability is ???
(Round to three decimal places as needed.)

4- a. How many unique Plickers cards are possible (not
considering rotation) if you want the code to be balanced. Which is
to say: each value has the same number of 1's and 0's? (Note: the
actual Plickers cards values are not balanced.)
b. How many more cards are possible if the code includes near
balanced values? Which is to say, rather than an equal number of
1's and 0's, from an equal number there is an extra 1 or...

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