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Consider all 10 digit numbers formed by ...

Consider all `10` digit numbers formed by using all the digits 0, 1, 2, 3,…, 9 without repetition such that they are divisible by 11111, then

A

the digit in tens place for smallest number is 6

B

the digit in tens place for largest number is 3

C

total numbers of such numbers is 3456

D

total numbers of such numbers is 365

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The correct Answer is:
To solve the problem of finding all 10-digit numbers formed by using the digits 0 to 9 without repetition that are divisible by 11111, we can break the solution down into several steps. ### Step-by-Step Solution: 1. **Understanding the Problem**: We need to find 10-digit numbers formed by the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 without repetition, such that the number is divisible by 11111. 2. **Divisibility Condition**: A number is divisible by 11111 if it is also divisible by 9 (since 11111 = 9 * 1234 + 5). Therefore, we need to check if our 10-digit number is divisible by 9. 3. **Sum of Digits**: The sum of all digits from 0 to 9 is: \[ 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45 \] Since 45 is divisible by 9, any arrangement of these digits will also be divisible by 9. 4. **Forming the Number**: We can represent our 10-digit number as \( N = x_1 x_2 x_3 x_4 x_5 x_6 x_7 x_8 x_9 x_{10} \), where each \( x_i \) is a digit from 0 to 9. 5. **Finding the Smallest and Largest Numbers**: - **Smallest Number**: To find the smallest number, we arrange the digits in ascending order, ensuring that the first digit is not 0. The smallest valid arrangement is 1023456789. - **Largest Number**: To find the largest number, we arrange the digits in descending order, which gives us 9876543210. 6. **Checking the 10th Place Digit**: - In the smallest number (1023456789), the digit in the 10th place is 9. - In the largest number (9876543210), the digit in the 10th place is 0. 7. **Counting the Total Numbers**: The total number of 10-digit numbers that can be formed using all digits from 0 to 9 without repetition is given by the factorial of the number of digits: \[ 10! = 3628800 \] ### Conclusion: The smallest number is 1023456789, the largest number is 9876543210, and the total number of valid 10-digit numbers is 3628800.

To solve the problem of finding all 10-digit numbers formed by using the digits 0 to 9 without repetition that are divisible by 11111, we can break the solution down into several steps. ### Step-by-Step Solution: 1. **Understanding the Problem**: We need to find 10-digit numbers formed by the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 without repetition, such that the number is divisible by 11111. 2. **Divisibility Condition**: ...
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