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1. Hannah gives clues about her 6 digit secret number:
Clue 1: It is the same number if you read it from right to left.
Clue 2: The number is a multiple of 9
Clue 3: Cross of the first and last digits. The only prime factor of the remaining four digit number is 11.
What is Hannah's 6 digit number?
2. The only way that 10 can be written as the sum of four different counting numbers is 1+2+3+4. In how many different ways can 15 be written be written as the sum of 4 different counting numbers? Assume the order does not matter.

Answer :

ritthaleremmy
1.  This is a rule which helps a person identify if a number is divisible by nine.
There is no specific answer to why this is observed but I believe that is just how multiples of nine and three behave!

It is the same with the multiples of three as well!

By the way the 6 digit number could be 513315
thanks, hope that helps!!

A) The six digit number of Hannah is; 513315

B) The number of ways that 15 be written be written as the sum of 4 different counting numbers is; 4 different ways

How to find a six digit number?

A) Hannah wants to give a clue about her 6 digit secret number. We are told that if you read the number from right to left, it will be the same number.

Also, the number is a multiple of 9. Lastly, we are told that if we cross off the first and last number, the only remaining prime factor of the remaining four digit number is 11.

From the list of numbers gotten online that fit the bill, the only one that applies in this case is 513315

B) The different ways that 15 can be written as a sum of four different numbers are;

1 + 2 + 3 + 9 = 15

2 + 3 + 4 + 6 = 15

1 + 2 + 5 + 7 = 15

1 + 3 + 4 + 7 = 15  

These are 4 different ways

Read more about six digit numbers at; https://brainly.com/question/26856218

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