Posted by Connor on Sunday, October 4, 2009 at 9:59am.
A number divisible by 11 has the property that the sum of even digits minus the sum of odd digits is 0 or divisible by 11.
14641 is divisible by 11 because
(4+4)-(1+6+1)=0
So if the missing digit is x, and if the number 21321x is divisible by 11, then
(1+2+x)-(2+3+1)=0
solve for x.
I am not following. The number you placed x in you used the number 21321x, but the number is 21421x. I am not following your steps to solve for x either
Sorry, it was a typo. My apologies.
For 21421X
So if the missing digit is x, and if the number 21421x is divisible by 11, then
(1+2+x)-(2+4+1)=0
solve for x.
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