ATQ, 45 + (3 X 3) = 54 54 + (3 X 4) = 66 66 + (3 X 5) = 81 81 + (3 X 6) = 99 99 + (3 X 7) = 120 120 + (3 X 8) = 144 Therefore, 81 should come in place of 84.
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