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What is the sum of all the four digit numbers formed using the digits 0 1 2 and 3 if repetition is allowed?
It is 415968.
What is the sum of all 4 digit numbers that are the same when their digits are reversed?
The sum of all palindromic numbers from 1001 to 9999 is 495000.
What is the sum of all two digit numbers which are divisible by 5?
945
What are all three-digit odd numbers whose digit sum is 9?
1, 3, and 5.
How many 7 digit phone numbers can be formed if all the numbers can be repeated?
823543
What are all of the numbers that are odd three digit numbers with a digit sum of 3?
111 and 201
What is the sum of all the four digit numbers formed using the digits 0 1 2 and 3 if repetition is allowed?
It is 415968.
What is the sum of all 4 digit numbers that are the same when their digits are reversed?
The sum of all palindromic numbers from 1001 to 9999 is 495000.
What is the sum of all 4 digit numbers that can be formed using digits 0179no repetition?
To make this simpler, I'll assume that numbers with a leading zero like 0179 are "four digit numbers" for the purposes of this question. The number of such numbers that can be formed by those numbers without repeating one of the digits is 4x3x2x1 = 24. We could list them all and add them up, but let's instead just realize that we can choose any digit and put it in any position, and the other digits can then be arranged in 3x2x1 = 6 ways. So the sum for any position is (0+1+7+9)*6 = 102, and the sum of the set of "four digit" numbers is 102x1000+102x100+102x10+102 = 113322. You can figure out for yourself what the sum would be if you exclude the numbers that are really three digit numbers (hint: use the technique above to find the sum of the three digit numbers that can be formed using the digits 1, 7, and 9; then subtract that from the other total).
What is the sum of all two digit numbers which are divisible by 5?
945
What are all three-digit odd numbers whose digit sum is 9?
1, 3, and 5.
How many 7 digit phone numbers can be formed if all the numbers can be repeated?
823543
Start with a three-digit number in which the digits are all different Use the digits to make all possible two-digit numbers and obtain their sum Investigate?
The sum is 22 times the sum of the three digits.
When this 3-digit number is rounded to the nearest ten or hundred the numbers round up all the of the digit in this numbers are the samethe sum of the digit is 15what is the number?
-12
What is the sum of all those 3 digit numbers with only odd digits?
69375
How many such 4 digit numbers are there in which the sum of all the digits is 2?
The answer depends on what is implied by "such".
What are all the four and five digit numbers that have a digit sum of 6 and are palindromes?
1221, 2112, 3003, 10401, 11211, 12021
