How many 7 digit phone numbers are possible if the number Cannot start with 0 and the digits Cannot repeat?
How many 7 digit phone numbers are possible if the number Cannot start with 0 and the digits Cannot repeat?
So the total number of ways in which 7-digit phone numbers are possible assuming that the first digit can’t be a 0 or a 1 are 8 * 10^6 = 8000000 including repetition.
How many 7 numbers are there in all?
Solution. Hence, there is a total of ninety lakh 7-digit numbers.
How do you find palindromic numbers?
How to check if a number is palindrome
- Declare two variables: one stores the given number, and the other stores the reversed number.
- Run the do-while loop until the number of digits in the reversed number are equal to the number of digits in the given number.
- Check if the reversed number is equal to the given number.
What is the meaning of palindromic numbers?
A palindromic number is a number (in some base ) that is the same when written forwards or backwards, i.e., of the form. . The first few palindromic numbers are therefore are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121.
What is palindromic time?
A palindrome time is a time – expressed in hours, minutes, and seconds – that is the same forwards and backwards, like 3:59:53. There are 660 palindrome times using a 24 hour clock.
How many 6 digit palindromic numbers are there?
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, … (sequence A002113 in the OEIS). Palindromic numbers receive most attention in the realm of recreational mathematics….Other bases.
| 70 | = | 1 |
|---|---|---|
| 73 | = | 111 |
| 74 | = | 777 |
| 76 | = | 12321 |
| 79 | = | 1367631 |
How many different 6 digit palindromes can be formed using the digits 7/8 or 9?
For suppose abc are the first 3 digits we have cba as the rest of digits which makes it a palindrome. Given only 3 digits (7,8,9) and 3 places we can make 3*3*3 different numbers i.e., 27.
Is string a palindrome Python?
Given a string, write a python function to check if it is palindrome or not. A string is said to be palindrome if the reverse of the string is the same as string. For example, “radar” is a palindrome, but “radix” is not a palindrome. Check if reverse and original are same or not.