The digits 0-9(0,1,2,3,4,5,6,7,8,9) can be rearranged into 3628800 distinct 10 digits numbers.
How many of these numbers are prime ?
Kaitlyn’s age plus three has an integer square root. Three years ago, Kaitlyn’s age was the square root.
How old is Kaitlyn?
If you wrote all of the numbers from 300 to 400 on a piece of paper, how many times would you have written the number 3?
How many 9's are there between 1 and 100?
What is the sum of all numbers between 100 and 1000 which are divisible by 14?
A newspaper is supposed to have 60 pages.Pages 14 and 21 are missing from the newspaper.
Can you tell me , Which other pages won't be there as well ?
4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of the tickets they need to buy ?
3 7 29 7 47 29 9 ? ?
Multiplication and addition of three numbers gives same result.
What are those numbers?
If 1+9+8=1, what is 2+8+9?
If 9999 = 4, 8888 = 8, 1816 = 6, 1212 = 0, then 1919 =?
Our dear Admin has a locker in a bank.
But, he has forgot the key to open the locker.
Fortunately, he remembers some things which may help you to help him.
· Key is a four digits number (eg.1234 or 9876)
· Every digit is different
· It starts and ends with an odd number and has two even numbers in the middle.
· 19 and 519 go into it exactly.
What is the key which will open the locker?
Four boys and three girls are seated in a row at random. What are the
chances that the two children at the ends of the row will be girls?