Question
In each of the following number series, one term is wrong. Find the wrong term. 4, 7, 12, 21, 28, 39, 52
Solution
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.
More Wrong Series Questions
- Find the wrong number in the given number series. 50, 64, 90, 134, 190, 260
- 53, 57, 66, 82, 117, 143, 192
- 420 342 272 212 156 110
- Find the wrong number in given series. 1759, 1765, 1785, 2047, 2099, 2209
- Find the odd one out in the following series: 452, 477, 526, 562, 602, 683
- 556, 547, 483, 458, 242, 196
- 100, 125, 143, 169, 198, 230, 265
- 25, 32, 47, 77, 126, 198
- 3, 15, 35, 63, 99, 143
- Find the wrong number in the given number series. 1024, 256, 64, 32, 4, 1
Relevant for Exams:
