# Thread: i really need help, its not that hard

1. ## i really need help, its not that hard

wich one does not belonq??? and why???

72 27 342 343

2. Originally Posted by Heidi
wich one does not belonq??? and why???

72 27 342 343
They are all divisible by 3 and 9 except for 343.

or: the digit sums are all 9 except for 343.

RonL

3. Originally Posted by Heidi
wich one does not belonq??? and why???

72 27 342 343
One more possibility
make pairs
if 1st number 72 then next number is 27(that is interchange of digits)
similarly
if 1st number is 342 second should be 243 (again interchange of digits) not 343 hence 343 should not belong to the sequence

4. Originally Posted by Heidi
wich one does not belonq??? and why???

72 27 342 343
*snort* Clearly 342 doesn't belong ...... The other three numbers all have a factor that's the cube of a prime number

By the way ...... the snort is me being facetious. There are also excellent reasons why

72 doesn't belong.

27 doesn't belong.

I find these types of questions quite ridiculous.

5. Originally Posted by mr fantastic
*snort* Clearly 342 doesn't belong ...... The other three numbers all have a factor that's the cube of a prime number

By the way ...... the snort is me being facetious. There are also excellent reasons why

72 doesn't belong.

27 doesn't belong.

I find these types of questions quite ridiculous.
Exactly, but we can't encourage the student to tell their teacher that, as they will just be poonished for being right

RonL