Find the wrong number of the series 7, 18, 40, 106, 183, 282, 403.
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40 is wrong no.
7 + 1 * 11 = 7 + 11 = 18
18 + 3 * 11 = 18 + 33 = 51
51 + 5 * 11 = 51 + 55 = 106
106 + 7 * 11 = 106 + 77 = 183
183 + 9 * 11 = 183 + 99 = 282
282 + 11 * 11 = 282 + 121 = 403.
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