There are 5,273,912,160 permutations of 5 numbers out of 90.
There are 90 such numbers.
There are 90 such numbers.
There are an infinite list of different numbers, but only 90 of them are integers (whole numbers).
90
70 and 90
There are 90 palindromes with 4 digits.The first digit can be any digit from the set {1,2,3,4,5,6,7,8,9}.With each choice of the first digit, the second can be any digit from the set {0,1,2,3,4,5,6,7,8,9}.That makes 9*10 = 90 permutations for the first two digits. These determine the palindrome since the third and fourth digits are the same as the second and first, respectively.
There are 90 palindromic numbers.
90
There are 16 numbers
There are 90 palindromic numbers between 100 and 1000
They are: 99 and 90
90