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Explanation:

Marks scored in WE are 20, 19, 18, 16, 15, 9, 8, 7, 4 and ‘a’.

As all scored different marks, ‘a’ can take one of the following values: 17, 14, 13, 12, 11, 10, 6, 5, 3, 2, 1

For a = 17, Harini’s composite score i.e., 47 would be same as Falak’s. Hence, a ≠ 17

For a = 14, Harini’s composite score i.e., 44 which is different from others.

Therefore, the required answer is 14.

Answer: 14

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