2.5 × 1 + 1 = 3.5
3.5 × 2 + 2 = 9
9 × 4 + 4 = 40
40 × 8 + 8 = 328
The given number series is 8, 16, 20, 36, 68
8
8 x 2 - 4 = 12 (NOT 16)
12 x 2 - 4 = 20
20 x 2 - 4 = 36
36 x 2 - 4 = 68
Hence, the odd man in the given series is 16.
In the given series numbers are arranged following the rule,
Therefore, the missing number is 27.
Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.
So, 9 is wrong.
From the beginning, the next term comes by adding prime numbers in a sequence of 2, 3, 5, 7, 9, 11, 13... to its previous term. But 165 will not be in the series as it must be replaced by 166 since 153+13 = 166.
In given Series, all the numbers except 54 are multiples of 5.
Here the series follows,
194
194 - (1x1 - 1) = 194
194 - (2x2 - 1) = 191
191 - (3x3 - 1) = 183
183 - (4x4 - 1) = 168
168 - (5x5 - 1) = 144
The given number series is 152, 124, 96, 69, 40
152
152 - 28 = 124
124 - 28 = 96
96 - 28 = 68 (not 69)
68 - 28 = 40
Hence, the odd man in the given number series is 69.
In the given series 1 4 9 16 22 36
1 = 1 x 1
4 = 2 x 2
9 = 3 x 3
16 = 4 x 4
25 = 5 x 5 (Not 22)
36 = 6 x 6
Hence, the odd man in the series is 22.
The given number series follows a pattern that
5 x 5 ? 1 = 24
24 x 4 ? 2 = 94
94 x 3 ? 3 = 279
279 x 2 ? 4 = 554
343 = , 1331 = , 2197 = , 121 =
343, 1331, 2197 are perfect cubes, but not 121.
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