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1800. That is, 900 positive values (100 to 999) and another 900 negative values (-100 to -999).

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Q: How many 3 digit numbers there in the Hindu-Arabic numeration?

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There are 9000 4-digit numbers in hindu-arabic numeration system

9000

All the numbers from 100 to 999 have three digits, as do all the numbers from -100 to -999, so that's 1800 in total.

None. 3 digit numbers are not divisible by 19 digit numbers.

There are 21 two-digit prime numbers.

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There are 9000 4-digit numbers in hindu-arabic numeration system

9000

All the numbers from 100 to 999 have three digits, as do all the numbers from -100 to -999, so that's 1800 in total.

1800. That is, 900 positive values (100 to 999) and another 900 negative values (-100 to -999).

How many two digit numbers are there in which the tens digit is greater than the oneβs digit ?

None. 3 digit numbers are not divisible by 19 digit numbers.

With a total of 90,000 five digit numbers, we can conclude that there is 45,000 EVEN five digit numbers.

There are five such numbers.

There are 21 two-digit prime 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.

It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.

There are 600 5-digit numbers divisible by 150.