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Therefore, wrong no. is 33
Wrong Number Series: 9, 5, 6, 10.5, 23, 90, 183
The solution is :
9 * .5 + .5 = 5
5 * 1 + 1 = 6
6 * 1.5 + 1.5 = 10.5
10.5 * 2 + 2 = 23
23 * 2.5 + 2.5 = 60 ≠ 90
60 * 3 + 3 = 183
Therefore, wrong no. is 90
Wrong Number Series: 318, 168, 78, 38, 18, 8, 3
The solution is :
8/2 – 1 = 3
18/2  1 = 8
38/2 – 1 = 18
78/2 – 1 = 38
168/2 – 1 = 83 ≠ 78
318/2 1 = 158 ≠ 168
Therefore, wrong no. is 168
Wrong Number Series: 3, 8, 18, 38, 80, 158, 318
The solution is:
3 * 2 + 2 = 8
8 * 2 + 2 = 18
18 * 2 + 2 = 38
38 * 2 + 2 = 78 ≠ 80
78 * 2 + 2 = 158
158 * 2 + 2 = 318
Therefore, wrong no. is 80
Wrong Number Series: 120, 143, 168, 195, 226, 255
(11)2 – 1 = 120
(12)2 – 1 = 143
(13)2 – 1 = 168
(14)2 – 1 = 195
(15)2 – 1 = 224 ≠ 226
(16)2 – 1 = 255
Therefore, wrong no. is 253
Wrong Number Series: 33, 39, 56, 85, 127, 185, 254
Therefore, it must be 42+14 = 56 i.e.
127 + 56 = 183
56 + 15 = 71 i.e. 183 + 71 = 254
Hence, wrong no. is 185
Wrong Number Series: 7, 9, 21, 67, 275, 1371, 8233
The solution is :
7 * 1 + 2 = 9
9 * 2 + 3 = 21
21 * 3 + 4 = 67
67 * 4 + 5 = 273 ≠ 275
273 * 5 + 6 = 1371
1371 * 6 + 7 = 8233
Therefore, wrong no. is 275
Wrong Number Series: 3, 6, 15, 45, 157, 630, 2835
The solution is :
3 * 2 = 6
6 * 2.5 = 15
15 * 3 = 45
45 * 3.5 = 157.5 ≠ 157
157.5 * 4 = 630
630 * 4.5 = 2835
Therefore, wrong no. is 157
Because, difference of the difference is prime numbers in increasing order therefore, wrong no. is 131
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