Fill in the blanks to make the statements true.

A four-digit number abcd is divisible by 11, if d + b = …………… or …………….. .


From the divisibility by 11 rule, if abcd is divisible by 11,


Then a-b + c-d = 0,


gives a + c = b + d, or each should be 0.


It also follows that a + c or b + d should be divisible by 11.


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