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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:
11 = 1 2² = 4 33 = 27 [25] 44 = 256 55 = 3125 66 = 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
