The pyramid below also has some mixed numbers already written in some of the blocks. As in

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The pyramid below also has some mixed numbers already written in some of the blocks. 

As in question 2 each block has a fraction which is the sum of the two fractions directly beneath it. 

a. Which block(s) of a, b, c or d can only have one possible fraction as an answer? Justify your answer.

b. Give a possible fraction for the block(s) where more than one answer is possible.

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