Series

Directions (Q. 1-5): In the following number series only one number is wrong. Find out the wrong number.

1. 14 13 22 55 212 1035
1) 55
2) 13
3) 212
4) 22
5) None of these


2. 217 224 213 226 210 228
1) 213
2) 226
3) 210
4) 228
5) None of these

3. 153 495 712 837 901 928
1) 712
2) 837
3) 901
4) 928
5) None of these

4. 11 42 214 1045 4148 12417
1) 42
2) 214
3) 1045
4) 4148
5) None of these

5. 488 245 124 64 35 20.25
1) 124
2) 64
3) 245
4) 35
5) None of these

1. 1; Here the series is:
14 × 1 - 1 = 13
13 × 2 - 4 = 22
22 × 3 - 9 = 57
57 × 4 - 16 = 212
212 × 5 - 25 = 1035
Hence, the wrong number is 55.

2. 3; Here the series is:
217 + 7 = 224
224 - 11 = 213
213 + 13 = 226
226 - 17 = 209
209 + 19 = 228
Hence, the wrong number is 210.

3. 5; Here the series is:
153 + 7^3 = 496
496 + 6^3 ? 712
712 +5^3 ? 837
837 + 4^3 ? 901
901+ 3^3 ? 928
Hence, the wrong number is 495.

4. 2; Here the series is:
11 × 7 - 7 × 5 = 42
42 × 6 - 6 × 6 = 216
216 × 5 - 5 × 7 = 1045
1045 × 4 - 4 × 8 = 4148
4148 × 3 - 3 × 9 = 12417
Hence, the wrong number is 214.

5. 4; Here, the series is
488 ÷ 2 + 1.0 = 245
245 ÷ 2 + 1.5 = 124
124 ÷ 2 + 2.0 = 64
64 ÷ 2 + 2.5 = 34.5
34.5 ÷ 2 + 3.0 = 20.25


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