Find the option that does not fit the series pattern: 7, 12, 19, 28, 39, 51, 67, 84
51
Find the differences: 12 − 7 = 5, 19 − 12 = 7, 28 − 19 = 9, 39 − 28 = 11.
The differences are consecutive odd numbers 5, 7, 9, 11, so the next differences should be 13, 15, 17.
Expected terms: 39 + 13 = 52, 52 + 15 = 67, 67 + 17 = 84.
The terms 67 and 84 fit, but the series shows 51 in place of 52.
Hence, the number that does not fit the series is 51.
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