There are 5 numbers which can make the 3 digit numbers in this example. Therefore each digit in the 3 digit number has 5 choices of which number can be placed there. Therefore number of 3 digit numbers = 5 x 5 x 5 = 125
Not sure what a "didget" is. It is possible to make 18 5-digit numbers.
8
about... 25 just take 5 numbers times 5 numbers
There are 600 5-digit numbers divisible by 150.
There are 5 numbers which can make the 3 digit numbers in this example. Therefore each digit in the 3 digit number has 5 choices of which number can be placed there. Therefore number of 3 digit numbers = 5 x 5 x 5 = 125
Not sure what a "didget" is. It is possible to make 18 5-digit numbers.
8
The first digit can be any one of 1,2,3,4,5. With each choice of digit1, the second digit can be any one of 1,2,3,4,5 so making 5*5 two-digit numbers. With each of these, the third digit can be any one of 1,2,3,4,5 so making 5*5*5 three-digit numbers and so on. The total number is 55 = 3125.
about... 25 just take 5 numbers times 5 numbers
2
The largest 5 digit perfect square is 99856 = 3162
There are 600 5-digit numbers divisible by 150.
12689 14689 12489
90
There are 5*4*3 = 60 such numbers.
The smallest 5-digit integer perfect square is 10,000 = (100)2The largest 5-digit integer perfect square is 99,856 = (316)2So we want to know how many numbers that is, from 100 to 316 inclusive.It's 316 minus the first 99 = 217 of them.