If ABCD x A= DCBA, what are the four digit numbers that give you this? And what is the equation? Without repitition?
Hello, MSYORK89!
Is there a typo?
We have:If , what are the four-digit numbers?
. .
If , the product is zero. .Hence,
If , the product is .Hence,
If , the product is a five-digit number. .Hence,
If , we have:
. .
In column-4, ends in 2.
. . Hence,
But in column-1, we see that
. . Therefore: .
If , we have:
. .
In column-4, we see that: .
But in column-1,
. . Therefore: .
The problem has no solutions.
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If the problem is: .
. . there is a solution: .