In each of the following number series, a wrong number is given. Find out that number.
1) 1, 11, 38, 78, 175, 301
A.11
B.78
C.175
D.301
E.None of these
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Answer B) 78
1+3^2+1 = 11
11+5^2+2 = 38
38+7^2+3 = 90
90+9^2+4 = 175
175+11^2+5 = 301
2) 7, 39, 85, 179, 211, 369, 879
A.369
B.211
C.179
D.879
E.None of these
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Answer D) 879
7*2+3 = 17
17*2+5 = 39
39*2+7 = 85
85*2+9 = 179
179*2+11 = 369
369*2+13 = 751
3) 5, 8.5, 54.5, 90.25, 250.25, 125.125
A.90.25
B.8.5
C.250.25
D.125.125
E.None of these
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Answer A) 90.25
5*0.5 = 2.5+6 = 8.5
8.5*5 = 42.5+12 = 54.5
54.5*0.5 = 27.25+18 = 45.25
45.25*5 =226.25+24 = 250.25
250.25*0.5 = 125.125
4) 65, 91, 13, 45.5, 2.6, 30.50, 0.52, 11.375
A.11.375
B.2.6
C.30.50
D.0.52
E.None of these
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Answer C)30.50
65*0.2 = 13
91/2= 45.5
13*0.2 = 2.6
45.5/2 = 22.75
2.6*0.2 = 0.52
22.75/2 = 11.375
5) 4, 100, 296, 654, 988, 1484
A.296
B.1484
C.988
D.654
E.None of these
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Answer D) 654
4+96 = 100
100+196 = 296
296+296 = 592
592+396 = 988
988+496 = 1484
6) 67, 68, 64, 73 , ?
A)57
B)53
C)65
D)73
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Answer A)57
67+1^2 = 67+1 = 68
68-2^2 = 68-4 = 64
64+3^2 = 64+9 = 73
73-4^2 = 73-16 = 57
7) 131, 138, 154, 188 ?
A)243
B)249
C)224
D)232
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AnswerB)249
131+7 = 138………….(7)
138+16 = 154…………(7+9 = 16)
154+34 = 188…………(16+18 = 34)
188+61 = 249………..(34+27 = 61)
8) 657, 679, 712, 756, ?
A)814
B)824
C)811
D)921
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Answer C)811
657+22 = 679
679+33 = 712
712+44 = 756
756+55 = 811
9) 27, 54, 324, 5832, ?
A) 341982
B) 314892
C) 341928
D) 314928
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Answer D) 314928
27*2=54
54*6 =324…..(2*3 =6)
324*18 = 5832….(6*3)
5832*54 =314928….(18*3=54)
10) 39, 40, 162, 1461, ?
A)37231
B)23737
C)23380
D)27733
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AnswerC)23380
39*1^2+1 = 39+1 = 40
40*2^2+2 = 40*4+2 = 162
162*3^2+3 = 162*9+3 = 1461
1461*4^2+4 = 23380
