Wrong Number Series is usually asked in all banking exams & it is an important topic as 3-5 questions are asked from this chapter. We will be given series which follows a certain pattern except one number & our job is to identify that number which does not follow that pattern & gave the answers accordingly.

**Directions (1-7): In the following number series, a wrong number is given. Find out that wrong number.**

**Ques 1: **1 4 25 256 3125 46656 823543

**Ques 2. : **2 6 15 30 45 43.5 22.5

**Ques 3: **4 5 13 40 108 229 445

**Ques 4: **18000 3600 720 148.5 28.8 5.76

**Ques 5. : **1.7 3.2 2.7 4.3 3.7 5.2 4.7

**Ques 6. : **3 4 13 38 87 165289

**Ques 7: **8, 11, 17, 31, 65, 165.5, 498.5

ANSWER |

1. The pattern of the number series is:

1^{1} = 1 2² = 4 3^{3} = 27 [25] 4^{4} = 256 5^{5} = 3125 6^{6} = 46656

**So, the wrong number in the series is 25.**

2.The pattern of the number series is:

2 × 3 = 6 6 × 2.5 = 15 15 × 2 = 30

30 × 1.5 = 45 45 × 1 = 45 [43.5] 45 × 0.5 = 22.5

**So, the wrong number in the series is 43.5**

3.The pattern of the number series is:

4 + 1³ = 5 5 + 2³ = 13 13 + 3³ = 40

40 + 4³ = 104 [108] 104 + 5³ = 229 229 + 6³ = 445

**So, the wrong number in the series is 108**

4.** **The pattern of the number series is:

18000 / 5 = 3600 3600 / 5 = 720 720 / 5 = 144 [148.5]

144 / 5 = 28.8 28.8 / 5 = 5.76

**So, the wrong number in the series is 148.5**

5.The pattern of the number series is:

1.7 + 1.5 = 3.2 3.2 – 0.5 = 2.7 2.7 + 1.5 = 4.2 [4.3]

4.2 – 0.5 = 3.7 3.7 + 1.5 = 5.2 5.2 – 0.5 = 4.7

**So, the wrong number in the series is 4.3**

6.The pattern of the number series is:

4 – 3 = 1² 13 – 4 = 9 = 3² 38 – 13 = 25 = 5²

87 – 38 = 49 = 7² [165] 168 – 87 = 81 = 9² 289 – 168 = 121 = 11²

**So, the wrong number in the series is 165**

7.The pattern of the number series is:

8 × 0.5 + 7 = 4 + 7=11

11 × 1 + 6 = 17

17 × 1.5 + 5 = 25.5 + 5 = 30.5 [31]

30.5 × 2 + 4 = 61 + 4 = 65

**So, the wrong number in the series is 31**