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How many numbers are equal to the sum of two odd one digit numbers?
2,4,6,8,10,12,14,16,18
How many three digit numbers have the sum of their digits equal to 22?
21.
How many three digit numbers is average of three digits equal to 2?
21
How many 5 digit combos in 30 numbers?
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
How many numbers are there between 100 and 999 in which all three digit numbers are different?
There are 9 possible numbers for the first digit (one of {1, 2, ..., 9}); with 9 possible digits for the second digit (one of {0, 1, 2, ..., 9} which is not the first digit)); with 8 possible digits for the third digit (one of {0, 1, 2, ..., 9} less the 2 digits already chosen); This there are 9 × 9 × 8 = 648 such numbers.
How many two-digit numbers has a digit sum equal to 5?
There are five such numbers.
How many three digit numbers equal 17?
There are no three-digit numbers that equal 17. In fact, there are no numbers with more or less than two digits that equal 17. In fact, in the whole infinite supply of numbers, there is only one single number that equals 17. That number is . . . . . . . 17 .
How many three digit numbers have the sum of their numbers equal to 5?
30,25,15,20, or 10.
How many numbers are equal to the sum of two odd one digit numbers?
2,4,6,8,10,12,14,16,18
How many combinations of three one digit numbers equal 4?
5
How many three digit numbers have the sum of their digits equal to 22?
21.
The number 64 is divisible by its unit digit 4 How many whole numbers less than 64 are divisible by their unit digit?
18 numbers are there
How many odd two digit numbers less than seventy are there?
30
How many three digit numbers is average of three digits equal to 2?
21
How many 5-digit numbers have digits whose product is equal to 4?
There are 15 of them.
How many palindromic 4 digit numbers are there less than 5000?
40. Excluding numbers starting with 0.
How many 5 digit numbers under 20000 are divisible by 4 and 9?
There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.
