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UKMT Junior Mathematical Challenge, 2018

Algebra Difficulty 2.0 Junior Find the answer United Kingdom

Ali wants to fill the empty squares so that the number in each square after the fourth from the left is the sum of the numbers in the four squares to its left. What number should Ali write in the final square?

(A) $16$ (B) $8$ (C) $4$ (D) $2$ (E) $1$

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