A four-digit number is given below. Unfortunately one of the digits is covered with ink. a. (i)

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A four-digit number is given below. Unfortunately one of the digits is covered with ink. 

a. (i) If the four-digit number is divisible by 4, what digit can the missing one be? 

(ii) Justify your answer. 

b. (i) If the four-digit number is also divisible by 9, what number must the missing one be?

(ii) Justify your answer.

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