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64 if repetition is allowed, 6 otherwise.

64 if repetition is allowed, 6 otherwise.

64 if repetition is allowed, 6 otherwise.

64 if repetition is allowed, 6 otherwise.

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64 if repetition is allowed, 6 otherwise.

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Q: How many different positive integers less than 2000 can be formed by using digits 123 and 4?
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How many different positive four digit integers can be formed if the first digit must be even the last digit must be odd and all digits must be distinct?

There are 320 such numbers.


How many numbers of at least tree different digits can be formed from the integers 123456?

Numbers formed should be of at least 3 digits means they may be of 3 digits, 4 digits, 5 digits or 6 digits. There are 6 choices for digit in the units place. There are 5 and 4 choices for digits in ten and hundred’s place respectively. So, total number of ways by which 3 digits numbers can be formed = 6.5.4 = 120 Similarly, the total no.of ways by which 4 digits numbers can be formed = 6.5.4.3 = 360. the total no. of ways by which 5 digits numbers can be formed = 6.5.4.3.2 = 720. The total no.of ways by which 4 digits numbers can be formed = 6.5.4.3.2.1 = 720. So, total no.of ways by which the numbers of at least 3 digits can be formed = 120 + 360 + 720 + 720 = 1920.


How many 6 digit numbers can be formed with 1 to 45 digits?

Assuming all 45 digits are different (which they will not be if they are ordinary integers), then 456, if repetitions are allowed. That is 8303765625. If repetitions are not allowed then the number falls to 45*44*43*42*41*40 = 5864443200


How many different 4-digit numbers can be formed from the digits of 0 2 4 and 7?

192, including ones containing repeat digits.


How many computer passwords that consist of 4 different digits can be formed from among the digits 0 to 9?

The number of 4 digit codes, using different digits, is 10*9*8*7 = 5040. However, computer passwords can, usually, have repeated digits and, if that is allowed, you can have 104 = 10000 codes.

Related questions

How many different positive four digit integers can be formed if the first digit must be even the last digit must be odd and all digits must be distinct?

There are 320 such numbers.


When the negative integers the positive integers and 0 are combined the integers are formed?

Negative integers, zero and the positive integers, together form the set of integers.


How many numbers of 3 digits and less than 500 can be formed from the integers 3 4 5 and 9 if the digits must be different?

12 numbers.


How many different positive integers can be formed if the first digit must be 2 the last digit cannot be 0 and digits may be repeated?

1 x 10 x 10 x 10 x 9 = 9000 1 = it must be 2 10's = any digits 9 = any digit BUT zero


How many numbers of at least tree different digits can be formed from the integers 123456?

Numbers formed should be of at least 3 digits means they may be of 3 digits, 4 digits, 5 digits or 6 digits. There are 6 choices for digit in the units place. There are 5 and 4 choices for digits in ten and hundred’s place respectively. So, total number of ways by which 3 digits numbers can be formed = 6.5.4 = 120 Similarly, the total no.of ways by which 4 digits numbers can be formed = 6.5.4.3 = 360. the total no. of ways by which 5 digits numbers can be formed = 6.5.4.3.2 = 720. The total no.of ways by which 4 digits numbers can be formed = 6.5.4.3.2.1 = 720. So, total no.of ways by which the numbers of at least 3 digits can be formed = 120 + 360 + 720 + 720 = 1920.


How many 4 digit numbers can be formed from digits 123456789?

There are 7,290 different 4-digit numbers that can be formed from the digits 1-9 without repetition.


How many 6 digit numbers can be formed with 1 to 45 digits?

Assuming all 45 digits are different (which they will not be if they are ordinary integers), then 456, if repetitions are allowed. That is 8303765625. If repetitions are not allowed then the number falls to 45*44*43*42*41*40 = 5864443200


How many four digits numbers can be formed using 0578?

If the digits are all different then 18. Otherwise, 192.


How many positive 3-digit integers can be formed that the 100s digit is equal to the sum of the 10s and 1s digit?

54


How many different 2 digit odd numbers can be formed from the digits 1 through 8 if no digits are repeated in a number?

36


How many different four-digit numbers can be formed from the digits 0 through 9?

10,000


How many different 4-digit numbers can be formed from the digits of 0 2 4 and 7?

192, including ones containing repeat digits.