+0  
 
+1
59
3
avatar+52 

i am so stuck that my head hurts

 May 5, 2023
 #1
avatar+207 
0

We may make use of the rule that if N's digits add up to a multiple of 3, N is a multiple of 3.

Since 6+7+8+9=30, which is a multiple of 3, all such N will be multiples of 3. Therefore the number you are looking for is the ways to organize the digits in N, which is 4!=24.

 May 5, 2023
 #2
avatar+52 
+1

it is incorrect but good try!

 May 5, 2023
 #3
avatar+118594 
+2

Hint:

Any integer is divisable by three if the its digits add up to a multiple of 3.     [sum of digits is a multiple of 2]

 

So what do you think the answer is?

 

You will have to work out 4 digit numbers, 3 digit numbers, 2 and 1 digit numbers all seperately.

 May 6, 2023
edited by Melody  May 6, 2023

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