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How many 3-digit numbers have exactly two sevens in them?
Leaving out 077, since it is actually a two digit number, the answer is 35.
How many sevens are there in 497?
There are exactly 71 of them.
How many 3-digit numbers have exactly 2 digits that are the same?
1
How many 3 digit numbers have 2 of the same digits?
Exactly 2: 243 of them.
How many 10 digit combinations are there for the numbers 0 through 9?
Exactly 3,628,800, or 10!.
How many 3-digit numbers have exactly two sevens in them?
Leaving out 077, since it is actually a two digit number, the answer is 35.
How many three digit numbers contain at least two sevens?
27: 077,177,277,377,477,577,677,877,977,717,727,737,747,757,767,777,787,797
How many 5 digit numbers contain exactly two 7 in them?
There are 6804 such numbers.
How many sevens are there in 497?
There are exactly 71 of them.
How many numbers between 100 and 600 have a 7 for at least one of the digits?
There aren't going to be any 7's in the hundreds digit, so first we look at how many there will be in the ones digit. Since there will be a 7 for every 10 numbers, and there are 501 numbers between 100 and 600 inclusive), we'll have floor(501 / 10) = 50 sevens in the ones digit. For the tens digit, we'll encounter 10 sevens for every 100, from 70 to 79, and so we have floor(501 / 100) = 5 times we'll have 70 - 79 so that's 5 * 10 = 50 sevens in the tens digit. However, we don't want to know how many sevens there are, we want to exclude overlaps. Thus we subtract every instance of 77 we see (overlap!), and we have floor(501 / 100) = 5 overlaps. 50 + 50 - 5 = 95, so a total of 95 numbers will have the digit 7 at least once.
How many numbers exactly have 1 digit?
the right answer is 10 cause there is o,1,2,3,4,5,6,7,8,9 so there 10 numbers in total which have 1 digit
How many four-digit numbers are there between 500 and 3000?
If you include the number 3,000, there are exactly 2,001 4-digit numbers between 500 and 3000.
How many 3-digit numbers have exactly 2 digits that are the same?
1
How many 3 digit numbers have 2 of the same digits?
Exactly 2: 243 of them.
How many whole numbers from 1 to 100 contain the digit 3 exactly once?
18
How many 10 digit combinations are there for the numbers 0 through 9?
Exactly 3,628,800, or 10!.
How many 6 digit numbers contain exactly different 4 digits?
There are 22680 numbers, excluding those with leading 0s.
