How many numbers can be made with 4 digits?
The smallest 4-digit number is 1,000 and the largest 4-digit number is 9,999, and there are a total of 9000 numbers from 1000 to 9999. We can make many four-digit numbers by using digits from 0 to 9 but we need to remember that the thousands place in a 4-digit number should not be 0.
How many 4 digit numbers can we make using the digits 2 3 4 and 5 without repetitions?
The sum of all the 4-digit numbers formed using the digits 2, 3, 4, and 5 (without repetition) is 93, 324.
How many 4 digit numbers can be formed from the digits 2 3?
There is 5 possible ways to fill ten’s place. There is 4 possible ways to fill hundredth place as digits cannot be repeated. There is 3 possible ways to fill the first place of four digit number. ∴ 60 four-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9.
How many 4 digit numbers can be made up of only odd digits repetitions?
=24 permutations of the 4 digits. Half of them end in 0 or 2, so only 12 of them are odd. Since a four-digit number can’t start with 0 we must exclude the permutations that start with 0.
How many numbers can you make out of 1234?
How many 4 digit numbers can you make 1234? How many 4 digit numbers can you make 1234? Thus if you are not allowed to repeat a digit the number of possible 4 digit numbers you can construct from 1,2,3,4 is 4 3 2 1 = 24.
How many four-digit numbers can be formed from the digits 1234 with repetition?
Hence, in this case there are 4 3 = 12 possible two digit numbers. For the third digit there are only 2 choices and for the last digit, one choice. Thus if you are not allowed to repeat a digit the number of possible 4 digit numbers you can construct from 1,2,3,4 is 4 3 2 1 = 24.
How many 4 digit numbers can be formed using 3 digits?
Clearly the 9 numbers are 1000,2000,3000,…,9000. Lastly we look at the cases in which 0 appears once. There are 9 ways to pick the other digit and 3 ways to order. So the final answer is 9×8×4+9+9×3.
How many 4 digit numbers that can be formed from the digits 2 3 5 6 7 and 9 which are divisible by 5 and none of the digits is repeated?
∴ 60 four-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9.