Question
In each of the following number series, one term is
wrong. Find the wrong term. 4, 7, 12, 21, 28, 39, 52Solution
ATQ, Check differences between consecutive terms: 7 − 4 = 3 12 − 7 = 5 21 − 12 = 9 28 − 21 = 7 39 − 28 = 11 52 − 39 = 13 We expect an increasing odd-number pattern: +3, +5, +7, +9, +11, +13 Correct series should be: 4, 7 (+3), 12 (+5), 19 (+7), 28 (+9), 39 (+11), 52 (+13) So the third term after 12 should be 19, not 21. Therefore, 21 is the wrong term.
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