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The number of 3-digit numbers with no repeated digits is simply 10x9x8 = 720, if you allow, for example, 012 as a 3-digit number.
There are 10 digits, any of which might be the first digit. The second digit can be any digit except the digit that was used for the first digit, leaving 9 possibilities. The third digit then has 8 possibilities, since it can't be the same as the first or second digit.
The actual number of possible area codes will be lower, because there are additional restrictions on the number combinations for a valid area code. For example, in North America (USA, Canada, etc.), the first digit of an area code cannot be 0 or 1 and the middle digit cannot be 9.
What else can I help you with?
Is 3.3166247903554 a rational number?
No, it is irrational because the decimal goes on without repeating.
How many 3 digit number are formed using the digits 3 5 7?
With repeating digits, there are 33 = 27 possible combinations.Without repeating any digits, there are 6 combinations:357375537573735753
Are repeating decimals an irrational number?
A repeating decimal is a rational number. Its value is(the repeating set of digits)/(as many 9s as there are digits above).
How many 4 number combinations are possible in 0-9 with repeating digits?
pls i need the formular of national game lotto
Is the square root of 150 irrational number?
Yes the square root of 150 is 12.247448713915890490986420373529This is irrational because the answer is a number that the decimal goes on forever without repeating.
What is the value of 5 in the smallest possible nine digit number without repeating?
4321
What is the greatest possible 9 digit number without repeating any digit?
987654321
What is the least possible 8-digit number without repeating any digit?
10234567
What is the greatest possible 7-digits number without repeating any digit?
9,876,543
What is the least possible 8-digits number without repeating any digit?
The least possible integer is -98765432. The least possible positive integer is 10234567.
How many two digit number combinations can you get using the number 1234 without repeating a digit?
There are twelve possible solutions using the rule you stated.
What is the place value of 5 in the smallest possible nine digit number without repeating?
The smallest possible 9 digit number (assuming negatives are not allowed) is 102,345,678 in which 5 is in the thousands' place.
What is the smallest 5 digit even number without repeating digits?
12345 but if you can use a decimal, then 0.1234 would be the smallest possible number.
What are every possible 4 digit number sequences possible without repeating the same 4 numbers in one sequence?
It would contain of all the number from 1000 to 9998 leaving 9 numbers.
How many 4 number combinations are possible with 12345 without repeating?
There are only five combinations: 1234, 1235, 1245, 1345 and 2345.
What is the least possible eight digit number without repeating any digit?
Assuming whole numbers and a leading zero does not count: 10,234,567
What is the greatest 7 digit number without repeating any number?
9876543
