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.
The given number series follows the pattern that,
24×0 + 4 = 4
4×1 + 9 = 13
13×2 + 16 = 42
42×3 + 25 = 151
151×4 + 36 = 640
Therefore, the odd number in the given series is 41
Except Granite all other options belong to the group of precious stones.
Each number is twice the preceding one with 1 added or subtracted alternatively.
So, the next number is (2 x 261 + 1) = 523.
The digits on either side of the letter in each of the groups 1P6, 2T0, and 1R8 indicate the place value of the letter in the alphabet.
This pattern is not followed by 2Y4.
Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16.
So, 9 is wrong.
In the given series numbers are arranged following the rule,
Therefore, the missing number is 27.
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.
2.5 × 1 + 1 = 3.5
3.5 × 2 + 2 = 9
9 × 4 + 4 = 40
40 × 8 + 8 = 328
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
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