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Which number will come in the place of question mark (?) to complete the following matrix?
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Each lower number is the square of the upper number minus an increasing count, as $$3^2 - 1 = 8$$, $$5^2 - 2 = 23$$, $$7^2 - 3 = 46$$, $$11^2 - 5 = 116$$ and $$13^2 - 6 = 163$$. So the missing number is $$9^2 - 4 = 77$$.
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