Series Completion Level - 3
Q1–10 of 51Direction: In the following number series, a wrong number is given. Find out the wrong number?
36, 18, 27, 70, 236.25, 1063.125?
The pattern is as followed:
36 × 0.5 = 18
18 × 1.5 = 27
27 × 2.5 = 67.5 ≠ 70
67.5 × 3.5 = 236.25
236.25 × 4.5 = 1063.125
Direction: In the following number series, a wrong number is given. Find out the wrong number?
1, 11, 35, 79, 124, 251?
The pattern is as followed:
1³ + 1² - 1 = 1 + 1 - 1 ⇒ 1
2³ + 2² - 1 = 8 + 4 - 1 ⇒ 11
3³ + 3² - 1 = 27 + 9 - 1 ⇒ 35
4³ + 4² - 1 = 64 + 16 - 1 ⇒ 79
5³ + 5² - 1 = 125 + 25 - 1 ⇒ 149
6³ + 6² - 1 = 216 + 36 - 1 ⇒ 251
∴ Wrong Number = 124
Direction: In the following number series, a wrong number is given. Find out the wrong number?
92, 291, 295, 268, 284, 161?
The pattern is as followed:
292 - (1)³ = 291
291 + (2)² = 295
295 - (3)³ = 268
268 + (4)² = 284
284 - (5)³ = 159
∴ Wrong term in the series = 161
Direction: In the following number series, a wrong number is given. Find out the wrong number?
12, 13, 28, 88, 352, 1765?
12×1+1, 13×2+2, 28×3+3, 87×4+4, 352×5+5
Hence, the wrong term in the given series is 88.
Direction: In the following number series, a wrong number is given. Find out the wrong number?
16, 17, 38, 123, 510, 2565?
16 17 38 123 508 2565
16×1+1², 17×2+2², 38×3+3², 123×4+4², 508×5+5²
Hence, the wrong term in the given series is 510.
Direction: In the following number series, a wrong number is given. Find out the wrong number?
2, 4, 12, 48, 200, 1440?
The pattern is as followed:
2 4 12 48 240 1440
2 × 1 = 2
2 × 2 = 4
4 × 3 = 12
12 × 4 = 48
48 × 5 = 240
240 × 6 = 1440
Hence, the wrong term in the given series is 200.
Direction: In the following number series, a wrong number is given. Find out the wrong number?
11, 25, 63, 109, 221, 445?
11 25 53 109 221 445
+14, +28, +56, +112, +221 (×2 each time)
Hence, the wrong term in the given series is 63.
Direction: In the following number series, a wrong number is given. Find out the wrong number?
119, 176, 260, 371, 509, 675?
119 176 260 371 509 674
+57, +84, +111, +138, +165 (second difference +27 each)
Wrong term = 674
Direction: In the following number series, a wrong number is given. Find out the wrong number?
100, 91, 81, 70, 60, 45?
-9, -10, -11, -12, -13
Hence, wrong term in the series is 60.
Direction: In the following number series, a wrong number is given. Find out the wrong number?
98, 128, 162, 200, 242, 266?
7² + 7² = 98
8² + 8² = 128
9² + 9² = 162
10² + 10² = 200
11² + 11² = 242
12² + 12² = 288
Hence, wrong term in the series is 266.