Find the wrong number in the series

1) Which is the wrong number in the given series:- 16, 21, 31, 46, 66, 90, 121, 156

(a) 90                     (b) 121                  (c) 66                     (d) 31

Answer: (a) 90

Solution with explanation:-

Every series has its own rule. Let us find the rule of this series.

Let a=16, b=21, c=31, d=46, e=66, f=90, g=121 and h=156 are numbers in series.

So b = 21 = 16 + 5

c = 31 = 21 + 10

d = 46 = 31 + 15

e = 66 = 46 + 20 and so on.

Thus we have to add respective multiple of 5 to get the next number.

Thus the number on 6^th position that is

f = 66 + 25 = 91.

And number on 7^th position means

g = 91 + 30 = 121.

g = 121 is given correctly in the series but given number f = 90 is wrong. Hence the wrong number in the series is 90 in the option (a).

Now practice the following problems based on the same series rule that is adding multiple of 5 to get next number.

2. Find out the wrong number in the following series:-

1) 3, 8, 18, 30, 53, 78, 108, 143, 183, 228, 278

(a) 18                     (b) 30                    (c) 143                   (d) 278

2) 62, 67, 77, 92, 110, 137, 167, 202, 242, 287, 337

(a) 287                  (b) 202                  (c) 110                   (d) 337

3) 163, 169, 178, 193, 213, 238, 268, 303, 343, 388, 438

(a) 303                  (b) 193                  (c) 438                   (d) 169

4) 282, 287, 297, 312, 332, 350,    387, 422, 462, 507, 557

(a) 422                  (b) 312                  (c) 350                   (d) 282

5) 549, 554, 564, 579, 599, 624, 650, 689, 729, 774, 824

(a) 18                     (b) 30                    (c) 143                   (d) 650

6) 783, 788, 798, 813, 833, 858, 888, 920, 963, 1008, 1058

(a) 783                  (b) 920                  (c) 888                   (d) 1008

7) 937, 942, 952, 967, 987, 1012, 1042, 1077, 1110, 1162, 1212

(a) 1110        (b) 942            (c) 942           (d) 987

8) 1309, 1314, 1320, 1339, 1359, 1384, 1414, 1449, 1489, 1534, 1584

(a) 1320                (b) 1584                (c) 1384             (d) 1414

9) 3599, 3604, 3614, 3629, 3649, 3674, 3700, 3739, 3779, 3824, 3874

(a) 3604                (b) 3629                (c) 3700            (d) 3874

10) 9933, 9938, 9948, 9963, 9983, 10007, 10038, 10073, 10113, 10158, 10208

(a) 10073              (b) 10007               (c) 9963            (d) 9948

Answers: - 1) = (b), 2) = (C), 3) = (d), 4) = (c), 5) = (d), 6) = (b), 7) = (a), 8) = (a), 9) = (c), 10) = (b)

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