- How do you find palindromic numbers?
- How many six digit numbers can be formed if no digits can be repeated?
- How many 4 digit numbers greater than 5000 can be formed?
- How many 6 digit numbers can be formed using the digits 1 to 6?
- How many palindromic numbers are there?
- What is the smallest 5 digit number which is a palindrome?
- How many different 6 digit palindromes can be formed using the digits 7/8 or 9?
- How many 6 digit palindromic numbers are there?
- How many 5 digit palindromic numbers are there?
- Why is 28 the perfect number?
- Is 2020 a palindrome?
- How many 5 digit numbers are there?

## How do you find palindromic numbers?

You can simply take any number and mirror it (which is always even in length) and for that same number simply add 0..

9 in between (for the numbers with odd length).

There is a brute force approach, that you loop through all the numbers and check whether they are palindrome or not..

## How many six digit numbers can be formed if no digits can be repeated?

Originally Answered: How many 6-digit numbers can be formed without repeating any digit from the digits 0,1,2,3,4,5 ? digits allowed are 0,1,2,3,4 and 5. A 6-digit number cannot have 0 in the leftmost space, therefore there are 5 possible digits for this space (1,2,3,4 or 5).

## How many 4 digit numbers greater than 5000 can be formed?

Answer. 1) To form a number greater than 5000, the thousands place must be filled with 5 (or) 6 (or) 7. = 3 ways. 2) After filling the thousands place we are left with 4 numbers(because repetition is not allowed) = 4 ways.

## How many 6 digit numbers can be formed using the digits 1 to 6?

how many six digit number can be formed using the digits 1 to 6, without repetition, such that the number is divisble by the digit at unit’s place. We will go through this step by step. This gives us total of 5 x 4 x 3 x 2 x 1 = 120 numbers.

## How many palindromic numbers are there?

90 palindromic numbersThere are 90 palindromic numbers with three digits (Using the Rule of product: 9 choices for the first digit – which determines the third digit as well – multiplied by 10 choices for the second digit): {101, 111, 121, 131, 141, 151, 161, 171, 181, 191, …, 909, 919, 929, 939, 949, 959, 969, 979, 989, 999}

## What is the smallest 5 digit number which is a palindrome?

Since it is a 5-digit number, we have the palindrome to be in the form ABCBA. If it ends in 9, that means A=9, and thus it must be in the form of 9BCB9. The smallest such palindrome will be to take B and C as 0, which results in 90009.

## 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.

## How many 6 digit palindromic numbers are there?

900 sixThere are 900 six-digit palindromes. A 6 digit palindromic number is in the form XYZZYX where X is non zero. Therefore there are 9 choices for X and 10 for each Y, Z.

## How many 5 digit palindromic numbers are there?

Since there are 9,000 five digit integers greater than or equal to 10,000 there are 9,000 – 900 = 8,100 five digit palindromes greater than or equal to 10,000.

## Why is 28 the perfect number?

In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 has divisors 1, 2 and 3 (excluding itself), and 1 + 2 + 3 = 6, so 6 is a perfect number. … For instance, 28 is perfect as 1 + 2 + 4 + 7 + 14 + 28 = 56 = 2 × 28.

## Is 2020 a palindrome?

Sunday – 02/02/2020 – is the first “global” palindrome since 11/11/1111. Unlike other palindromic dates, such as 10/02/2001, 2 February, 2020 is considered a global palindrome because it is exactly the same written both in the DD/MM/YYYY format as well as the US standard of MM/DD/YYYY.

## How many 5 digit numbers are there?

A simple idea: The Place Value of Numbers The smallest 5 -digit number is 10000, while the largest 5 -digit number is 99999. These 90000 possible 5 -digit numbers can have any number from 0 to 9 in any of the places, except for the placement of zero such that there is no non-zero number to its left.