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10293330201309i31841481389
None. 3 digit numbers are not divisible by 19 digit numbers.
With 123 digits you can make 123 one-digit numbers.
None. The sum of one digit can't be twice the size of the digit.
There are no pairs of 2-digit numbers with a difference of 90 if both numbers are positive or both negative. However, with one positive and one negative, there are 71 pairs.
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How many two digit numbers are there in which the tens digit is greater than the one’s digit ?
10293330201309i31841481389
None. 3 digit numbers are not divisible by 19 digit 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.
Number of 7 digit combinations out of the 10 one-digit numbers = 120.
Only one . . . 999 .
With 123 digits you can make 123 one-digit numbers.
None. The sum of one digit can't be twice the size of the digit.
2,4,6,8,10,12,14,16,18
The possibilities are all the counting numbers from the largest 16-digit one to the largest 17-digit one.99,999,999,999,999,999 minus 9,999,999,999,999,999 = 90,000,000,000,000,000
Eight (8) of them do.They are1221243642486384 .