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How many three digit numbers have three distinct digits?
For a 3 digit number, the left most or the most significant digit cannot be zero. So it can be 1,2,3,4,5,6,7,8 or 9 which is 9 possibilities. The middle number can be 0,1,2,3,4,5,6,7,8,9 which is 10 possibilties but one of the digits has been chosen already as the first digit, so the possibilities are only 9. The right most number can be 0,1,2,3,4,5,6,7,8,9 which is 10 possibilities but two of the digits have been already used by the left most and the middle digits. That leaves only 8 possibilities. So the total number of three digit numbers that have three distinct digits is 9 x 9 x 8 = 81 x 8 = 648 possibilities
What is the probability of guess a two digit number?
On a number line, the digits from 10 to 99 are all two digit numbers. How many numeber are that? There is a short cut. You can subtract 10 from 99 and that gives you the number of numbers between 10 and 99 including 10, but you need to add one more to include 99 as well. So, 10 from 99 is 89 adding 1 is 90 ,which is the amount of numbers total that are two digit. The probability of guessing a two digit number is 1/90 =D
Use a 3 digit number to form all two digit numbers?
By using the 3 digits of a number we can form 3 different two digit numbers. 3C2 = 3!/[(3 - 2)!2!] = 3!/(1!2!) = (3 x 2!)/2! = 3
What is the greatest even two digit number. The product of its digits is 72.?
98
What is a three digit number a square number and the product of its digits is two?
121 because 2x1x1=2 and 11x11=121
What is the greatest two digit number with the least number of factors?
97 has two factors.
What two-digit number has two one-digit factors that have a sum of 16 and a difference of 2?
63? But it has more than two one-digit factors.
What two digit digit number has two one digit factors that have a sum of 16 and a difference of 2?
63
What two digit number has 8 factors?
24
What two digit number has nine factors?
36
What two digit number has the fewest factors?
25
What two digit number has two one-digit factors that have a sum of 16 an a difference of 2?
63.
What is a two digit number that is a prime number and a factor of 100 and 1000?
The two-digit factors of 100 and 1000 are all composite.
What is the smallest three-digit number that has only two factors?
101 is the first three-digit prime number.
What two digit even number has 8 factors?
24
What two digit number is a factor of 20?
Both 10 and 20 are two-digit numbers that are factors of 20.
What is the second smallest two- digit number that has an odd number of factors?
25
