Q192
ArithmeticNumber Series & Progressions
Find the wrong number in the series:
1, 2, 8, 33, 148, 760, 4626
- a.8
- b.33
- c.148
- d.760
Answer: (D) 760
The rule is next term = term × n + $n^2$ for n = 1, 2, 3…: 1 × 1 + 1 = 2, 2 × 2 + 4 = 8, 8 × 3 + 9 = 33, 33 × 4 + 16 = 148. The next term should be 148 × 5 + 25 = 765, and 765 × 6 + 36 = 4626 confirms it, so 760 is wrong. 8, 33 and 148 all fit the rule.