Find the number which replaces the question mark.

4

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6

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8

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10

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Solution

The correct option is A $6$
$2^{2} - 2 = 2$ $9^{2} - 9 = 72$ $8^{2} - 8 = 56$
$3^{2} - 3 = 6$ $1^{2} - 1 = 0$ $7^{2} - 7 = 42$
$4^{2} - 4 = 12$ $5^{2} - 5 = 20$ $6^{2} - 6 = 30$

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Which number replaces the question mark?

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